EP0024149A1 - Tandem-Massenspektrometer und Verfahren zum Betrieb eines Massenspektrometersystems - Google Patents

Tandem-Massenspektrometer und Verfahren zum Betrieb eines Massenspektrometersystems Download PDF

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Publication number
EP0024149A1
EP0024149A1 EP19800302634 EP80302634A EP0024149A1 EP 0024149 A1 EP0024149 A1 EP 0024149A1 EP 19800302634 EP19800302634 EP 19800302634 EP 80302634 A EP80302634 A EP 80302634A EP 0024149 A1 EP0024149 A1 EP 0024149A1
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EP
European Patent Office
Prior art keywords
rods
gas
mass spectrometer
ions
spectrometer system
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Granted
Application number
EP19800302634
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English (en)
French (fr)
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EP0024149B1 (de
Inventor
John Barry French
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Canadian Patents and Development Ltd
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Canadian Patents and Development Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J49/00—Particle spectrometers or separator tubes
    • H01J49/004—Combinations of spectrometers, tandem spectrometers, e.g. MS/MS, MSn
    • H01J49/0045—Combinations of spectrometers, tandem spectrometers, e.g. MS/MS, MSn characterised by the fragmentation or other specific reaction
    • H01J49/005—Combinations of spectrometers, tandem spectrometers, e.g. MS/MS, MSn characterised by the fragmentation or other specific reaction by collision with gas, e.g. by introducing gas or by accelerating ions with an electric field
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J49/00—Particle spectrometers or separator tubes
    • H01J49/02—Details
    • H01J49/06—Electron- or ion-optical arrangements
    • H01J49/062—Ion guides
    • H01J49/063—Multipole ion guides, e.g. quadrupoles, hexapoles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J49/00—Particle spectrometers or separator tubes
    • H01J49/26—Mass spectrometers or separator tubes
    • H01J49/34—Dynamic spectrometers
    • H01J49/42—Stability-of-path spectrometers, e.g. monopole, quadrupole, multipole, farvitrons
    • H01J49/4205—Device types
    • H01J49/421—Mass filters, i.e. deviating unwanted ions without trapping

Definitions

  • This invention relates to a tandem mass spectrometer system with open structure AC-only rod sections and a method of operating such a system.
  • a tandem mass spectrometer system may be used to create ion species from a sample, select one individual ion species, fragment that species, and obtain the mass spectrum of the fragments.
  • the paper discloses that a quadrupole mass filter, AC-only quadrupole section, and a second quadrupole mass filter are arranged in series. Gas is introduced into the center quadrupole section to produce collision induced dissociation. Each quadrupole is arranged in its own cylindrical container with end apertures and operates separately. With a system such as this, it is found that ion signal losses are very large as the ions travel from one quadrupole to the next, and therefore the sensitivity of the apparatus is low. The invention therefore aims to increase sensitivity in such systems.
  • the present invention provides a structure which provides greatly increased sensitivity by permitting close coupling of the tandem sections.
  • the rods of the adjacent sections are located closely adjacent each other, and the gas introduced into the AC-only section is largely removed, before it can enter a mass filter section, by forming the rods or a portion of the rods of the AC-only section as open structures, so that the gas can be removed directly through the rods as well as between them.
  • the open rod structure of the AC-only section may also be used in conventional mass spectrometers, where ions from a gassy source outside a vacuum chamber are admitted with gas into the vacuum chamber and are guided through the vacuum chamber to a mass spectrometer in the chamber. Such an arrangement is shown in U.S. Patent No. 4,148,196. Open structure AC-only rods may be used as will be described to guide the ions from the aperture of the vacuum chamber to the mass spectrometer.
  • Fig. 1 shows a vacuum chamber generally indicated at 2 and which contains three mass spectrometer sections generally indicated at 4, 6, and 8 respectively.
  • Spectrometer section 2 is a conventional quadrupole mass spectrometer and contains four rods 10 arranged in a conventional quadrupole square pattern.
  • Spectrometer section 8 is also a conventional quadrupole mass spectrometer and similarly contains four rods 12 arranged in a normal square pattern.
  • Spectrometer section 6 also contains four rods 14, arranged as shown in Fig. 3 in normal quadrupole fashion. However the rods 14 have solid center portions, indicated at 14-1, and open structure end extensions, indicated at 14-2.
  • the center portions 14-1 of rods 14, and also the rods 10, 12 of quadrupole sections 4, 8 are held in conventional holder plates 16 (Fig. 3).
  • the plates 16 of quadrupole sections 4, 8 are located in conventional cylindrical cans or housings 18 (Figs. 1, 3) which are normally used for mass spectrometers.
  • the cans or housings 18 have apertures 2 0 therein to allow gas within the mass spectrometer sections 4 , 8 to be pumped away.
  • the center protions 14-1 of rods 14 are however housed in a cylindrical can 32 which is closed except at its ends, which are defined by end discs 24 having apertures 26 therein.
  • a duct 28 carries a target gas from a source 29 into the can 22 and into the space between the centre portions 14-1 of rods 14.
  • the open structure rod extensions 14-2 of the rods 14 are formed, as shown in Figs. 4, 5 of thin stiff rods or wires 30.
  • Each set of wires 30 is arranged in a curved configuration to simulate the shape of the outer portion of a normal quadrupole rod, so that the field porduced by the four sets of wires 30 will correspond as closely as possible to the normal hyperbolic field 31 (Fig. 4) produced by the solid rods of a conventional quadrupole.
  • the wires 30 are supported at their inner ends by welds or solder connections to the solid rod portions 14-1. At their outer ends the wires 30 are supported by a holder 32 (see especially Fig.
  • the three quadrupole sections 4, 6, 8 are mounted in axial alignment, end to end along the axis of the cylindrical vacuum chamber 2, being held in positon by support members not shown.
  • Each rod of each of the three sets is aligned axially with each corresponding rod of each other set, so that the spaces between the rods of each set are linearly aligned, for ions to pass therethrough.
  • the ends of the rods 10, 12 and 14 are insulated from each other by a small air gap or thin layer of insulating material, indicated at 33.
  • the end wall of the vacuum chamber 2 contains an aperture 34 through which ions to be examined are supplied from an ion source 36.
  • Ion source 36 may typically be the source shown in U.S. Patent 4,148,196, in which a trace gas is admitted to an ionization chamber, ionized, and the resultant ions are drawn by appropriate electric potentials through a curtain gas chamber into the vacuum chamber 2.
  • Curtain gas in the curtain gas chamber serves to block entry of unwanted materials into the vacuum chamber 2, and the curtain gas, which may typically be argon or nitrogen, also enters the vacuum chamber where it is cryopumped thus permitting maintenance of a high vacuum in chamber 2.
  • a refrigerating mechanism 38 is provided having an inner tubular finger or cold station 40 and an outer finger or second cold station 42.
  • the mechanism 38 is typically able to extract 2 to 4 watts of thermal energy from the inner finger 40 at 12° to 20°K, and is also typically able to extract 5 to 10 watts of thermal energy from the outer finger 42, at 70° to 90°K.
  • a copper support tube 44 is mounted on the top of the inner finger 40, in good thermal contact therewith, and supports at each end a cylindrical shell 46, also made of a good thermal conducting material such as copper.
  • the shells 46 have end walls 48 and contain slots (not shown) in their upper surfaces so that the center quadrupole section 6 may be fitted downwardly into the shells 46.
  • a pair of intermediate shells 52 are connected to the outer finger 42 and serve to reduce the heat load on the inner shells 46.
  • the intermediate shells 52 are mounted on an outer copper support tube 54 concentric with the inner support tube 44, the outer tube 54 being mounted on the second finger 42.
  • the exterior surfaces of the intermediate shells 52 are insulated with aluminized plastic film, as indicated at 56, to reduce heat radiation to the intermediate shells 52.
  • the outer end walls of the intermediate shells 52 contain inset centre sections 50 spaced by annular gaps 62 from the outer end wall sections 54 and supported thereon by support struts, not shown.
  • the gaps 62 assist in cryopumping gas from the end quadrupole sections 4, 8, as will be explained.
  • the intermediate shells 52 also contain slots, shown at 64, Fig. 2, in thin upper surfaces to facilitate assembly of the operations.
  • ion species from a sample to be considered are supplied from ion source 36 and are focused (by conventional means not shown) to enter the first quadrupole section 4.
  • ions of the desired mass are selected and enter the central quadrupole section 6.
  • the ions encounter a target gas supplied via duct 28 into the space 68 between the rods 14 of the center quadrupole section.
  • the resultant collisions induce dissociation of the ions into fragments or daughter ions, which are then transmitted into the third quadrupole section 8.
  • the third quadrupole section 8 acts as a mass filter, selecting the desired fragments or daughter ions for detection by an ion detector 70.
  • the end quadrupole sections 4, 8 are supplied with conventional AC and DC voltages, but the center quadrupole section 6, which must pass a wide range of masses, has only an AC voltage applied to its rods 14.
  • the gas pressure in the first and third quadrupole sections 4, 8 must be low, typically 10 torr or less for proper quadrupole operation.
  • the vacuum chamber 2 is pumped either by being fitted with appropriate cryo-cooling surfaces, as explained in patent 4,148,196, or by vacuum pumps connected to ports 72 in the chamber 2.
  • Target gas in the center quadrupole section 6, which tends to enter the space between the rods of the end quadrupole sections 4, 8, is largely pumped away by flowing through the open spaces between the wires 30 and conaensing on the cooled surfaces of inner shells 46.
  • the advantages of the open structure of the rod extensions 14-2, formed by wires 30, are as follows. Normally in a quadrupole section the gap dl (Fig. 3) between the rods is relatively small compared with the diameter d2 of the rods (typically dl may be about one third of d2). Thus if the rods are solid, relatively little gas can escape between them, and therefore a substantial gap must be left between the ends of adjacent quadrupole sections, so that the gas can exit through this gap and so it will not unduly pressurize the cans of the end quadrupole sections 4, 8. For reasons to be explained, large gaps between the quadrupole sections result in substantial ion signal losses.
  • the quadrupole sections 4, 6, 8 can be placed very closely adjacent each other, the ends of the rods of each section being separated only by the small gap 33 as discussed. Since a quadrupole section having an AC-only field applied thereto requires less accuracy of manufacture than a quadrupole section having both AC and DC applied to its-rods, the open structure described may be used with little or no degradation in performance. Provided that the open sections 14-2 are of reasonably substantial length, only a small proportion of the target gas entering the centre quadrupole section 6 will travel into the end sections 4, 8.
  • the parameters of the system may be adjusted so that the gas density in the target region, i.e. in the space between rods 14-1, is in the range between 10 -3 torr and 10 torr, and the lengths of rod extensions 14-2 are each equal to the lengths of rods 14-1 (e.g. 4 inches).
  • most of the gas in the target region 68 travels outwardly through the gaps between the wires 30, as indicated by arrows 76, Fig. 5. Only a small proportion of the gas, indicated by arrows 78, is beamed directly into the space between the rods of the end quadrupole sections 4, 8.
  • the gas flow entering the spaces between the rods of the end quadrupole sections 4, 8 may be only about 1/200 of the flow through duct 28.
  • the ions leaving one quadrupole section must pass through a complete fringing field which ranges from the high value of the field existing at the end of the quadrupole rods down to zero, and then as they enter the next quadrupole section they must pass through a further complete fringing field. This causes high ion transmission losses.
  • the longitudinal spacing between the quadrupole sections should be r o or less, where r o is the radius of the inscribed circle within the rods 14-1 or 14-2.
  • Fig. 6 shows in block diagram form an electrical system for operating the mass spectrometer system described.
  • an oscillator 80 is provided which produces an AC voltage of the frequency required for mass spectrometer operation (typically 1 to 3 MHz).
  • the AC voltage is applied through a buffer amplifier 82 (which prevents feedback) to a power amplifier 84 and to the AC terminals 86 of the first quadrupole section 4.
  • DC is supplied by rectifying a portion of the power amplifier output in a rectifier 88 and applying the resultant DC to the terminals 86.
  • Mass selection is controlled by a mass command unit 90, which by varying the output of buffer amplifier 82 controls the level of the AC (and hence also the DC) voltage applied to terminals 86. This changes the operating point of the first quadrupole section 4, in order to select a desired mass for transmission through the rods 10.
  • the oscillator 80 is also connected through a phase shifter 92 to another buffer amplifier 94.
  • the output of amplifier 92 is connected to another power amplifier 96 which applies AC to the terminals 98 of rods 14 of the centre quadrupole section 6. No DC is applied to the rods 14.
  • This arrangement ensures that the AC voltage applied to rods 14 is synchronized in frequency and phase with that applied to rods 10 so that the resultant AC fields are synchronized in frequency and phase.
  • the phase shift will be zero or nearly zero.
  • the oscillator 80 is also connected through a second phase shifter 100 to another buffer amplifier 102.
  • the output of buffer amplifier 102 is connected to power amplifier 104 which is connected to the AC terminals 106 of the rods 12 of of the third quadrupole section 8.
  • DC is again supplied by a rectifier 108, and the level of the voltages applied is controlled by a mass command unit 110 which adjusts the output of buffer amplifier 102.
  • phase shifter 100 again ensures that the AC voltage applied to the rods 12 is synchronized in frequency and phase with the AC voltage applied to the rods 10, 14, again so that the AC fields will be synchronized in frequency or phase.
  • the phase shift will be zero or nearly zero.
  • the DC voltage applied to the rods 10, 12 are nor- mally in phase, but as explained in the said co-pending application, the DC voltages can be applied with advantage in some applications so that the DC fields produced by rods 10, 12 are 90° out of phase.
  • FIGs. 7 and 8 show a modification of the structure of Figs. 1 to 5.
  • primed reference numerals indicate parts corresponding to those of Figs. 1 to 5.
  • the rods 14' of the centre quadrupole section 6' are of open structure (formed by wires 30') along their entire length, i.e. the solid centre portions have been eliminated.
  • the inner shells 46 have therefore been combined into a single shell 46' connected to the inner cold finger 40', and the intermediate shells 52 have been combined into a single shell 52' connected to the outer cold finger 42'.
  • a high pressure free jet of target gas is provided.
  • gas is supplied via plastic tubing 28' to a precooling chamber 120 which is of heat conducting material (e.g. copper) and is thermally in good contact with the intermediate shell 52'.
  • Gas flowing through tube 28' is precooled in chamber 120 and then emerges from aperture 122 of chamber 110 in the form of a free jet 124.
  • the free jet passes through the open structure rods 14' into the target region 68' between the rods.
  • the density distribution in the target region 68' then has generally a cosine squared distribution, being a maximum at point 126 and falling off toward the ends 128.
  • Figs. 7 and 8 has several advantages over that shown in Figs. 1 to 5.
  • gas travels axially through the space between the solid centre portions 14-1 and thus some gas is beamed directly at the end quadrupole sections 4, 8.
  • the gas is beamed across the axis of the centre quadrupole section 6' and therefore is less likely to enter the end quadrupole sections.
  • the centre quadrupole section 6' can now be made shorter, e.g. 10 cm. in length. This saves high frequency electric power (which is roughly proportional to the length of the rods) and also reduces the cost of the apparatus, since the vacuum chamber is now shorter.
  • FIGs. 7 and 8 the inner and intermediate shells 46', 52' are shown split into two halves each joined at flanges 128, 129, for easy assembly and disassembly.
  • a disadvantage of the Figs. 7 and 8 arrangement is that each target gas molecule is effectively only used once (since it travels across the axis of the centre quadrupole section 6) rather than effectively being used more than once as in the Figs. 1 to 5 version, where the molecules bounce generally back and forth across the target region as they migrate outward, parallel to the quadrupole axis. Therefore the Figs. 7 and 8 arrangement requires a higher gas flow through tube 28, to achieve the same integrated target density, typically 5 to 20 times as much gas as in Figs. 1 to 5.
  • the precooling chamber 120 reduces the molecular velocity of the gas molecules typically by half, giving an effective density gain of two, i.e. for the same gas mass flow, twice the effective density is achieved in the target region 68'.
  • the outer cooling finger 42' which has a much higher capacity.
  • the remainder of the vacuum chamber 2' in the Figs. 7 and 8 arrangement may be pumped by cryo-cooling surfaces extended from the inner and outer cold fingers 40', 42', or by separate cooling surfaces connected to a separate refrigerating device.
  • Figs. 7 and 8 are pumped by conventional diffusion pumps, rather than by cryopumping, then the arrangement will typically be as shown in Fig. 9.
  • inner shell 46' and both cold fingers 40', 42'
  • intermediate shell 52' terminates, below the quadrupole rods, in a diverging conical hood 130.
  • Hood 130 extends to a duct 132 leading to a diffusion pump or a turbo pump (not shown). Since the gas is being beamed directly into the pump, the effective capacity of the pump is considerably increased (typically by a factor of three) over its capacity if it were handling random gas flow.
  • the remainder of vacuum chamber 2' is pumped by a pump connected to duct 134, and the ion source 36' is pumped by a pump connected to duct 136.
  • FIG. 10 and 11 A modification of the Figs. 7 and 8 arrangement is shown in Figs. 10 and 11.
  • the only change made is that the exit from precooling chamber 120 is now through a standard collimated hole structure 138, which is simply a block of metal with numerous holes 139 formed therein which create about 80% transparency.
  • the collimated hole structure 138 produces numerous beamlets 140 of gas which, if the pressure is not too high, travel directly across the target area 68' without significant interference with each other.
  • the collimated hole structure 138 can typically be operated to produce a uniform pressure of 10 -3 torr in the target region 68' along the whole length of structure 138, with a fairly sharp drop-off of gas density at each end. If the pressure becomes too high, however, the beamlets 140 of gas collide with each other and scatter, producing a more diffuse pressure border.
  • rod extensions 14-2 are shown as being self supporting stiff wires mounted at their ends, better transparency can be obtained by using fine wires mounted in tension.
  • rod 14' consists of two end discs 140 each of an insulating material, joined together by two stiff insulating bars 142, one at each side of the discs 140. Stretched between the discs 140 are five thin wires 30'; a larger or smaller number of wires can however be used, depending on how accurately it is desired to create the field.
  • the rod diameter is 0.625 inch, as is typical, and if it is desired to have the open structure rod about 90% transparent, then the total wire diameter (ignoring the bars 142) will be .0625 inches and the diameter of each of the five wires 30' is .0125 inches.
  • the wires 30' are anchored in the discs 30' by conventional means, not shown.
  • each rod 14' may be formed from a metal cylinder, etched to produce holes therein yielding the desired transparency.
  • a metal cylinder may be used to form each rod 14', etched to produce holes therein yielding the desired transparency.
  • such a structure is not preferred because of its delicacy.
  • An open rod structure may also be formed using the principles given in a paper by H. Matsuda and T. Matsuo entitled “A New Method of Producing an Electric Quadrupole Field", published in the International Journal of Mass Spectrometry and In Physics, No. 24, 1977 at page 107.
  • a quadrupole field can be produced using a number of wires suitably located, and not necessarily in the same locations as the usual solid rods themselves would assume.
  • Such a structure can be used and a gas target region created within it, provided that there is minimal interference with gas escaping from the structure.
  • the wires which produce a quadrupole field in effect act as rods and the term "rods" in the appended claims refers to any groups of open wires or other open structure which produces a quadrupole type field.
  • the transparency of the open rod structure used should not be less than about 2/3, since below this value one-third or more of the gas molecules bounce off the rod structure, scatter, and increase the load on the remaining quadrupole sections.
  • an openess or transparency of 90% or more is provided.
  • Figs. 13 and 14 shows an arrangement similar to the apparatus shown in Figs. 1 and 2 of said U.S. patent 4,148,196 except for the use of AC-only rod extensions, and which will therefore be described relatively briefly.
  • the Figs. 13 and 14 arrangement includes a vacuum chamber 202 which includes an inner shell 204, an intermediate shell 206 and an outer vacuum shell 208.
  • the inner shell 204 includes spaced circumferential cooling fins 214 secured thereto and radiating inwardly therefrom, and is in good thermal contact with inner cold station 215 of refrigerating mechanism 216.
  • the intermediate shell 206 is open at its rear and is cylindrical in form with cooling fins 217 thereon and has a conical front 218 having an enlarged axial opening 220 therein.
  • the intermediate shell 206 is mounted on the outer finger or second cold station 226 of the refrigerating mechanism 216.
  • the outer vacuum shell 208 has a cylindrical side wall 230 and front and rear walls 232, 233 respectively.
  • the rear wall 233 is closed but the front wall 232 has a small central axial opening 235 therein co-axial with the opening 220.
  • the outer shell 208 forms a gas tight enclosure around the inner and intermediate shells 204, 206 except for the front opening 235.
  • the gas curtain chamber 236 is closed, except for a curtain gas inlet orifice 238 at its edge walls, and except for central axial openings 240, 242 in its rear and front faces.
  • the openings 240, 242 are axially aligned with the opening 235 so that ions can be transferred through the three openings into the vacuum chamber 202.
  • a sample gas containing trace components to be analyzed is introduced via inlet duct 244 into a chamber 246 which is fitted with a discharge needle 248.
  • the trace components are ionized directly by electric discharge from the needle 248, or the ionization process may alternatively be indirect, through chemical ionization using one or more chemical reagent gases included in the sample gas.
  • the trace ions once formed are drifted by appropriate potentials on the plates containing orifices 240, 242, through these orifices and into the vacuum chamber 202.
  • the sample gas itself is blocked from entering the vacuum chamber by the curtain gas introduced via inlet 238 into the curtain gas chamber.
  • the curtain gas is a conveniently inert cryopumpable gas such as argon and is admitted into the curtain gas chamber 236 at a pressure such that a portion of the curtain gas effuses out of the opening 242 to block the gases in chamber 246 from entering the vacuum system, and these gases together with the portion of the curtain gas which effuses out the opening 242, exit via duct 250.
  • a portion of the curtain gas enters the vacuum chamber with the ions to be analyzed and is cryopumped by condensation on the fins 214.
  • a quadrupole mass spectrometer 252 is mounted on the rear surface 254 of the vacuum chamber and is protected from the cold by insulation 257.
  • Spectrometer 252 includes four conventional solid rods 256.
  • the rod extensions 258 serve to guide ions entering the vacuum chamber to the mass spectrometer 252 while at the same time permitting gas which enters the chamber to pass through them to condense on the cooling fins 214.
  • the rods 256 are supplied conventionally with AC and DC voltages, e.g.
  • rod extensions 258 are supplied with AC only, e.g. from terminals 98 of the Fig. 6 circuit.
  • the AC voltages applied to both rod sets are synchronized in frequency and phase so that the AC fields produced by both rod sets are synchronized in frequency and phase, preferably with a zero or near zero phase shift as described previously.
  • the AC-only rod extensions 258 are preferably relatively long, so that the ions pass through at least several complete cycles of the AC field (typically at least six cycles or more) before they reach the solid rods 256.
  • the AC only rod extensions 258 substantially assist in guiding the ions into the solid rods 256 and at the same time create little interference with the gas flow out of the vacuum chamber.
  • the front discs 140a which support the wires 301 are preferably slanted as shown to reduce interference with the gas flow from orifice 235.
  • a declustering element shown in dotted lines at 264 in Fig. 13 and being as described in U.S. patent 4,121,099 can be placed between discs 140a and the orifice 235 to decluster ions entering the vacuum chamber. Element 264 also deflects much of the gas flow entering the vacuum chamber through orifice 235 away from the space between extensions 258.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electron Tubes For Measurement (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
EP19800302634 1979-08-03 1980-08-01 Tandem-Massenspektrometer und Verfahren zum Betrieb eines Massenspektrometersystems Expired EP0024149B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA000333326A CA1134956A (en) 1979-08-03 1979-08-03 Tandem mass spectrometer with open structure ac-only rod sections, and method of operating a mass spectrometer system
CA333326 1979-08-03

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EP0024149A1 true EP0024149A1 (de) 1981-02-25
EP0024149B1 EP0024149B1 (de) 1984-07-04

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2129607A (en) * 1982-10-16 1984-05-16 Finnigan Mat Gmbh Hybrid mass spectrometer
US4535236A (en) * 1983-02-25 1985-08-13 Vg Instruments Group Limited Apparatus for and method of operating quadrupole mass spectrometers in the total pressure mode
GB2201289A (en) * 1986-10-15 1988-08-24 Vestec Corp Method and apparatus for dissociating ions by electron impact
WO2003090363A1 (en) 2002-04-19 2003-10-30 Thomson Licensing S.A. Diversity scheme for error control coding in a system with prioritized data
CN105869987A (zh) * 2016-05-30 2016-08-17 大连交通大学 一种四极质谱仪
EP3005401A4 (de) * 2013-06-03 2016-12-14 Perkinelmer Health Sci Inc Ionenleiter oder -filter mit ausgewählter gasleitfähigkeit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2538452A1 (de) * 1974-08-30 1976-04-08 Extranuclear Lab Inc Verfahren und einrichtung zum raeumlichen trennen von hochfrequenten und niederfrequenten elektrischen feldern und deren anwendung auf randfelder in quadrupol-massenfiltern
DE2539161A1 (de) * 1975-09-03 1977-03-17 Varian Mat Gmbh Massenspektrometer
US4148196A (en) * 1977-04-25 1979-04-10 Sciex Inc. Multiple stage cryogenic pump and method of pumping

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2538452A1 (de) * 1974-08-30 1976-04-08 Extranuclear Lab Inc Verfahren und einrichtung zum raeumlichen trennen von hochfrequenten und niederfrequenten elektrischen feldern und deren anwendung auf randfelder in quadrupol-massenfiltern
DE2539161A1 (de) * 1975-09-03 1977-03-17 Varian Mat Gmbh Massenspektrometer
US4148196A (en) * 1977-04-25 1979-04-10 Sciex Inc. Multiple stage cryogenic pump and method of pumping

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2129607A (en) * 1982-10-16 1984-05-16 Finnigan Mat Gmbh Hybrid mass spectrometer
US4535236A (en) * 1983-02-25 1985-08-13 Vg Instruments Group Limited Apparatus for and method of operating quadrupole mass spectrometers in the total pressure mode
GB2201289A (en) * 1986-10-15 1988-08-24 Vestec Corp Method and apparatus for dissociating ions by electron impact
GB2201289B (en) * 1986-10-15 1990-09-12 Vestec Corp Method and apparatus for dissociating ions by electron impact
WO2003090363A1 (en) 2002-04-19 2003-10-30 Thomson Licensing S.A. Diversity scheme for error control coding in a system with prioritized data
EP3005401A4 (de) * 2013-06-03 2016-12-14 Perkinelmer Health Sci Inc Ionenleiter oder -filter mit ausgewählter gasleitfähigkeit
CN105869987A (zh) * 2016-05-30 2016-08-17 大连交通大学 一种四极质谱仪

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DE3068430D1 (en) 1984-08-09
EP0024149B1 (de) 1984-07-04
CA1134956A (en) 1982-11-02

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