SE192554C1

SE192554C1 -

Info

Publication number: SE192554C1
Application number: SE1165858A
Authority: SE
Original assignee: Siemensschuckertwerke Aktiengesellschaft; Wolfgang Paul
Priority date: 1957-12-27
Filing date: 1958-12-16
Publication date: 1964-11-10
Also published as: NL234370A; DE1071376B; GB904033A; FR1222503A; IT600824A

Description

Uppfinnare: W Paul, H-P Reinhard och H Frohlich Prioritet begord iron den 27 december 1957 (Forbundsrepubliken Tyskland) Genom den tyska patentskriften 944 900 är ett forfaringssdtt for separering resp. for separat pavisande av joner med specifik laddning forut kant, vid vilket jonerna infOras i ett tiden periodiskt elektriskt falt, vars potential 99 at en kvadratisk funktion av koordinatorna x, y, z av den allmanna formein 99 = f (t) (ax2,8y2 — 7z2) Harvid betyder f(t) en godtycklig periodisk funktion av tiden. a, ,8 och 7 aro positiva konstanter, som satisfiera ekvationen a -I- fi ==y och for ovrigt aro godtyckligt valjbara. Inventors: W Paul, H-P Reinhard and H Frohlich Priority requested on 27 December 1957 (Federal Republic of Germany) According to German patent specification 944 900, a procedure for separation resp. for separate detection of ions with specific charge leading edge, at which the ions are introduced in a time periodic electric field, whose potential 99 is a quadratic function of the coordinators x, y, z of the general form 99 = f (t) (ax2,8y2 - 7z2) Harvid means f (t) an arbitrary periodic function of time. a,, 8 and 7 are positive constants, which satisfy the equation a -I- fi == y and are otherwise arbitrarily selectable.

Alltefter sin speciella laddning beskriva j 0- nerna i detta falt, som paverka dem till svangningar, stabila eller instabila banor, varigenom en separering eller separat registrering erhalles. Sasom periodisk funktion f (t) kan exempelvis en. sinussvangning anvandas, som at overlagrad pa ett konstant varde. Till alstring av potentialen tjana lampligt formade elekiroder, vilka i det betraktade speciella fallet tillforas en likspanning och en sinusformig vaxelspanning med hog frekvens. According to their special charge, describe the j 0- ns in this field, which influence them to oscillations, stable or unstable paths, whereby a separation or separate registration is obtained. As a periodic function f (t), for example, one. sine oscillation is used, as if superimposed on a constant value. To generate the potential, lamp-shaped electric rods serve, which in the particular case considered are supplied with a direct voltage and a sinusoidal alternating voltage with a high frequency.

Ur teorien for forfaringssattet erhallas stabila omraden, Mom vilka amplituden hos svangningarna av joner med bestamd specifik laddning icke overskrider ett maximivarde. For narmare detaljer hanvisas till namnda patentskrift. From the theory of the method of operation, stable ranges are obtained, Mom which the amplitude of the oscillations of ions with a certain specific charge does not exceed a maximum value. For further details, reference is made to the said patent specification.

I patentskriften hanvisas a-ven till att man vid rotationssymmetriska falt genom overlagring av ett ytterligare vaxelfalt, som har liten amplitud och vars frekvens at halften sa stor som hogfrekvensen, i ett brett stabilt omrade kan inbadda ett smalt instabilt omrade. Darigenom skola joner med bestamd specifik laddning avskiljas fran en isotopblandning. The patent also refers to the fact that in the case of rotationally symmetrical fields, by superimposing an additional gear field, which has a small amplitude and whose frequency is half as large as the hog frequency, a narrow unstable area can be embedded in a wide stable area. Thereby, ions with a specific specific charge are separated from an isotope mixture.

Med den i patentskriften angivna storleken pa overlagringsfrekvensen (halv hogfrekvens) kan emellertid det onskade resultatet endast vinnas i ett mycket begransat antal praktiska anvandningsfall. Mera ingaende undersokningar ha visat, att inbaddningen ay ett instahilt omrade i ett brett stabilt omrade i allmanhet och amen vid icke rotationssymmetriska falt ä mojlig, om man installer det extra overlagrade faltets frekvens pa den valda arbetspunkten Mom det stabila omradet. With the size of the overlay frequency (half high frequency) specified in the patent specification however, the desired result can only be obtained in a very limited number of practical use cases. More thorough studies have shown that the embedding is a instahilt range in a wide stable range in general and amen in non-rotationally symmetrical fields is possible, if you install the frequency of the extra superimposed field at the selected working point Mom the stable range.

Enligt foreliggande uppfinning bringas dot overla:grade vaxelfaltets frekvens att atminstone tillnarmelsevis iiverensstamma med grund- eller overtoner hos joner med bestamd specifik laddning och framtvingar instabila banor for dessa joner. According to the present invention, the frequency of the dot overlap gradient is caused to at least approximately coincide with fundamental or harmonics of ions with a specific specific charge and force unstable paths for these ions.

Grundtonernas joner med bestamd specifik laddning aro utom av denna aven beroende av likspanningens storlek, hogfrekvensspanningens amplitud, sjalva hogfrekvensen och av elektrodernas geometri och kunna for en given anordning utan vidare bestammas mid vane arbetspunkt. De aro proportionella mot hogfrekvensen, varvid proportionalitetsfaktorn k tager hansyn till den valda arbetspunkten Mom det stabila omradet. Overtonerna erhallas omedelbart sasom summa av resp. differens mellan heltalsmultiplar av h5gfrekvensen a ena sida:n och av grundtonerna a andra sidan. The ions of the fundamental tones with a specific specific charge are, apart from this, also dependent on the magnitude of the direct voltage, the amplitude of the high-frequency voltage, the high-frequency itself and on the geometry of the electrodes, and can be easily determined for a given device. They are proportional to the high frequency, the proportionality factor k taking into account the selected operating point Mom the stable range. The harmonics are obtained immediately as the sum of resp. difference between integer multiples of the h5g frequency on one side and of the fundamental tones on the other side.

Pa bifogade ritning visas ett sa kallat stabilitetsdiagram for en cylindersymmetrisk elektrodanordning (x-axeln sasom symmetriaxel). Vardena a oth q, med vilka koordinataxlarna Oro betecknade, bestamma arbetspunkten och erhallas ur anordningens data pa foljande salt: eV q = 2 — Dan i betyda e laddningen, m massan, U lik- a = 4 e U m r2coa m r2co2 2— — sp5.nningen, V hagfrekvensamplituden, r elektrodavstanden ochhogfrekvensen. 2 Stabilitetsomradet visas pa ritningen med tjocka linjer. I detsamma angivas karakteristikor for proportionalitetsfaktorn k. De heldragna linjerna galla for z-komponenten och de streckade linjerna fOr y-komponenten av jonrorelsen. Antalen grand- och overtoner aro saledes olika fOr de hada komponenterna, vilket b8r beaktas vid farfaringssattet enligt uppfinningen. The accompanying drawing shows a so-called stability diagram for a cylindrical symmetrical electrode device (x-axis as well as axis of symmetry). The values a oth q, with which the coordinate axes Oro denoted, determine the operating point and are obtained from the data of the device on the following salt: eV q = 2 - Dan i mean e charge, m mass, U lik- a = 4 e U m r2coa m r2co2 2— - sp5.nningen, V hagfrekvensamplituden, r electrode distance and high frequency. 2 The stability area is shown in the drawing with thick lines. The same indicates the characteristics of the proportionality factor k. The solid lines apply to the z-component and the dashed lines for the y-component of the ion movement. The numbers of grand and harmonics are thus different for the had components, which should be taken into account in the coloring method according to the invention.

Det angivna forfaringssattet enligt uppfinningen kan utstrackas till avskiljande av joner med flera olika specifika laddningar genom att flera extra vaxelfalt med motsvarande frekvens gemensamt Overlagras pa lik- och hogfrekvensfaltet. The stated method according to the invention can be extended to separate ions with several different specific charges by jointly superimposing several additional gear fields with corresponding frequency on the DC and high frequency fields.

Det har iakttagits, att nagon strong avstamning av overlagringsfaltets frekvens pa. grundresp. overtonernas joner, som skola avskiljas, joke erfordras. Vid frekvensdifferenser utfora jonerna svangningar, vilkas amplituder kunna bli sá stora, att ett avskiljande intrader. It has been observed that some strong descent of the frequency of the overlay field pa. basic resp. the ions of the harmonics, which must be separated, joke required. In the case of frequency differences, the ions perform oscillations, the amplitudes of which can become so large that a separating intrader.

Enligt ytterligare en uppfinningstanke utnyttjas donna foreteelse for att gemensamt avskilja joner Mom ett omrade med olika specifik laddning utan att man. behover anvanda lika manga overlagringsfrekvenser som olika specifika laddningar foreligga. I stallet kan avskiljandet astadkommas genom overlagring av ett eller flera vaxelfalt, vilkas frekvenser atminstone debris ligga mellan jonernas grund- eller overtoner. According to a further inventive concept, this phenomenon is used to jointly separate ions Mom an area with different specific charge without. need to use as many overload frequencies as different specific charges are available. In the stable, the separation can be achieved by superimposing one or more gear folds, the frequencies of which are at least debris between the fundamental or harmonics of the ions.

Det ma sarskilt hanvisas till att omradet med olika specifika laddningar joke behOver vara sammanhangande Exempelvis kan man gemensamt avskilja joner med bestamd specifik laddning enligt deras overtoner °eh joner med annan specifik laddning enligt deras grundtoner under forutsattning, att dessa grundtoner aro intilliggande. Harvid fir det aven nthjligt att gripa tillbaka till olikheten hos grundtonerna i de enskilda rorelsekomponenterna. Grund- och i5vertonernas joner, som icke skola avskiljas, maste ligga Haackligt langt bort fran Overlagrincsfrekvensen. It is especially pointed out that the region with different specific charges jokeJover need to be coherent. In this case, it is also possible to return to the difference in the fundamental tones in the individual movement components. The ions of the fundamental and ivertons, which are not to be separated, must be haackligt far away from the Overlagrinc frequency.

Dessutom fir det mojligt ate genom val av frekvenserna och/eller amplituderna hos de overlagrade vaxelfalten separat bestamma svangningsamplituden fOr jonerna med varje specifik laddning. Ju stone overlagringsfaltens amplitud valjes, desto bredare blir avskiljningsomradet. Darigenom blir det moj ligt att giva exempelvis en foreliggande isotopblandning en annan onskad sammansattning i en enda. arbetsoperation. Harvid kunna enskilda massor helt avskiljas, eller alla komponenter forandras endast till sin storlek. Mojligheten fOr en enkel och snabb andring av en isotopblandnings sammansattning utOr en speciell fordel med forfaringssattet enligt uppfinningen. In addition, by selecting the frequencies and / or amplitudes of the superimposed gear folds, it is possible to separately determine the oscillation amplitude of the ions with each specific charge. The more the amplitude of the stone overlay field is chosen, the wider the separation area. This makes it fun It is possible to give, for example, a present isotope mixture another desired composition in a single. work operation. In this case, individual masses can be completely separated, or all components can only be changed to their size. The possibility of a simple and rapid change of the composition of an isotope mixture out of a special advantage of the process set according to the invention.

Claims

Patent claim:

Procedure for the separation or separate detection of ions with different specific charge, the ions being introduced into a time-periodic electrical control field, the potential of which has an arbitrary periodic time function f (t) Or a quadratic function of the coordinators x, y, z of the the general form f (t) (ax2fly2 - 7Z2) used in the constants a, fi, y satisfies the equations a + # = 7, and wherein the control field is superimposed with another gear field, which can be characterized by the fact that the frequency of the superimposed gear field is caused to at least approximately consistent with fundamental or harmonics of ions with a specific charge and forcing unstable paths for these ions.

2. A method according to claim 1, characterized in that for the separation of ions with different specific charges several gear fields with corresponding frequencies are jointly superimposed on the periodic field in time.

3. A method according to claim 1, characterized in that ions having an area with different specific charge are separated by superimposing one or more gear folds, the frequencies of which are at least partly between the fundamental or harmonics of the ions.

4. A method according to claim 3, characterized in that the proportion of the separation for each particular specific charge is determined and installed by appropriate selection of the frequencies and / or amplitudes of the superimposed gear folds. Request publications: Patents Germany 944 900. Agent: H Onn, Stockholm Stockholm 1064. Sung '. Boktr. P. A. Norstedt & Sorter. 6400591