CN101191785A - Molecule photodissolved fragment translational energy spectrometer - Google Patents
Molecule photodissolved fragment translational energy spectrometer Download PDFInfo
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- CN101191785A CN101191785A CNA2006101443341A CN200610144334A CN101191785A CN 101191785 A CN101191785 A CN 101191785A CN A2006101443341 A CNA2006101443341 A CN A2006101443341A CN 200610144334 A CN200610144334 A CN 200610144334A CN 101191785 A CN101191785 A CN 101191785A
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- reaction chamber
- aperture plate
- molecular beam
- fragment
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Abstract
The invention discloses a photofragment translational spectroscopy which comprises a source chamber and a reaction chamber, wherein, a pulsed molecular beam valve is arranged in the source chamber, the position of the joint of the source chamber and the reaction chamber, opposite to an output end of the pulsed molecular beam valve is provided with a funnel scoop; part of gas sprayed from the pulsed molecular beam enters into the reaction chamber to form a molecular beam after being collimated by a pore of the funnel scoop; a photolysis laser beam and an ionization laser beam are arranged in the reaction chamber and are vertically crossed with the molecular beam which enters into the reaction chamber at a photolysis point after being respectively focused through a lens; photofragment ions freely fly and reach a detection grid, and reach a micro-channel plate to be detected via a weak electric field area and a high-field area. The photofragments in the invention freely fly after being ionized without an electric field, so the invention does not need any accelerating stabilized voltage supply; moreover, the distance of the free flight of the photofragment ions is very short, so the size of the spectroscopy of the invention is much smaller.
Description
Technical field
The present invention relates to be used to study the experimental facilities of molecular photodissociation reaction kinetics, particularly relate to a kind of energy spectrometer in order to the translation energy of measuring the molecular photodissociation fragment.
Background technology
At present, the photodissolved fragment translational energy spectrometer (abbreviating PTS as) that generally uses mainly contains two big classes: rotating large-scale PTS of molecular beam and ion imaging type PTS in the industry.Former structure complexity, huge, operating difficulties, detecting device are also very complicated, and require ultrahigh vacuum (P10
-8～10
-9Pa); The latter does not need ultrahigh vacuum, high vacuum (P10
-4～10
-5Pa) get final product, but the fragmention flying distance is longer, equipment is still bigger, and detecting device needs highly uniform large-scale microchannel plate and expensive CCD camera.
Summary of the invention
The objective of the invention is to make a kind of simple in structure, easy to use, cheap molecule photodissolved fragment translational energy spectrometer, but this energy spectrometer still has very high resolving power.
For achieving the above object, the technical solution used in the present invention is: a kind of molecule photodissolved fragment translational energy spectrometer, it includes a chamber, a source and a reaction chamber, the indoor pulse molecular beam valve that is provided with in described source, the position of the joint of chamber, described source and reaction chamber and positive alignment pulse molecular beam valve delivery outlet is provided with the funnel spoon; The gas of described pulse molecular beam valve ejection, a part enters reaction chamber and forms molecular beam behind the aperture collimation of funnel spoon; Be provided with a laser photolysis bundle and an ionization laser beam in the described reaction chamber, this laser photolysis bundle and ionization laser beam are vertically intersected on the photodissociation point with the molecular beam that enters reaction chamber respectively after lens focus; The free flight of photolysis debris ion arrives and detects aperture plate, and is detected through arriving a microchannel plate behind a weak electric field area and the forceful electric power place again.
In practical operation, be provided with a ground connection in the described reaction chamber and detect aperture plate, a low-voltage aperture plate and a high voltage microchannel plate detector, this ground connection is detected and is added with a weak accelerating field between aperture plate and the low-voltage aperture plate, is added with one between this low-voltage aperture plate and the microchannel plate detector and forces fast electric field; This microchannel plate detector also is connected with reaction chamber outer a prime amplifier and a data collector in turn.In addition, the lower end of chamber, described source and reaction chamber is respectively arranged with a cover high vacuum pump.
In the above-mentioned molecule photodissolved fragment translational energy spectrometer, described data collector is the data collecting card of hyperchannel counter or computer configuration.Described ground connection is detected aperture plate, the low-voltage aperture plate is the aperture plate of column type.
So the present invention is owing to take above design, have the following advantages: 1, free flight after the photolysis debris ionization among the present invention, so added electric field not is without any need for the acceleration stabilized voltage supply.2, among the present invention, the free flight of molecular photodissociation fragmention distance is very short, only be several centimetres (as 3 centimetres or 6 centimetres), so the overall dimensions of energy spectrometer of the present invention is much smaller.3, among the present invention, detecting device only need use common microchannel plate, and does not need the CCD camera, but also can obtain high-resolution experimental result.4, among the present invention, ground connection is detected aperture plate and is adopted cylindrical (cylindrical radius equals the radius of newton's ball 6, only is several centimetres, as 2.5 centimetres or 5 centimetres) to replace planar shaped, has improved resolving power, and increases detection aperture plate area, has improved detection sensitivity again.5, ground connection is detected aperture plate between microchannel plate detector, increases by a low-voltage aperture plate, and this measure is penetrated into the free flight district to prevent the highfield before the microchannel plate, has avoided the adverse effect to resolving power.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
As shown in Figure 1, be a kind of molecule photodissolved fragment translational energy spectrometer provided by the present invention, it includes a chamber, a source 1 and a reaction chamber 2.
Be provided with pulse molecular beam valve 11 in the chamber, source 1, chamber, source 1 is provided with the narrow meshed funnel spoon 12 in center with the joint of reaction chamber 2 and the position of positive alignment pulse molecular beam valve 11 delivery outlets, sample gas is by 11 ejections of pulse molecular beam valve, through the aperture of funnel spoon 12, enter reaction chamber and form molecular beam 20.
Be provided with a laser photolysis bundle 21 and an ionization laser beam 22 in the reaction chamber 2, this laser photolysis bundle 21 and ionization laser beam 22 are vertically intersected on photodissociation point O with molecular beam 20 respectively after lens focus; The free flight of photolysis debris ion arrives and detects aperture plate, and is detected through arriving a microchannel plate detector 25 behind a weak electric field area and the forceful electric power place again.This laser photolysis bundle 21 and ionization laser beam 22 can be produced after the frequency doubling system frequency multiplication by the bright dipping of YAG laser pumping dye laser again.YAG laser instrument, dye laser and frequency doubling system can directly directly be bought from the city outside the venue, do not do too much at this and give unnecessary details.
Specifically, be provided with a ground connection in the reaction chamber 2 and detect aperture plate 23, low-voltage aperture plate 24 and a high voltage microchannel plate detector 25, this ground connection is detected and is added with a weak accelerating field (not shown) between aperture plate 23 and the low-voltage aperture plate 24, is added with one between this low-voltage aperture plate 24 and the microchannel plate detector 25 and forces fast electric field (not shown); This microchannel plate detector 25 also is connected with reaction chamber outer a prime amplifier 3 and a data collector 4 in turn.
In the lower end of chamber, source 1 and reaction chamber 2, also respectively be provided with a cover high vacuum pump 5 respectively.In addition, data collector 4 can be the data collecting card of hyperchannel counter (MCS) or computer configuration.
In the present invention, the ground connection that receives ion is detected the cylindrical aperture plate of aperture plate 23 employings, and cylindrical radius equals the radius of newton's ball 6, can improve resolving power like this, and can strengthen cylindricality aperture plate area to improve detection sensitivity.Detect aperture plate 23 to 25 of microchannel plate detectors, be provided with columniform low-voltage aperture plate 24, be penetrated into of the influence of free flight district resolving power to reduce microchannel plate detector 25 preceding highfields.The present invention can be by choosing cylindrical low-voltage aperture plate 24 suitable cylindrical radius and suitable low-voltage to detect the flight time of ion in detection system of aperture plate 23 different parts identical so that arrive ground connection.
In the foregoing description, laser photolysis bundle 21 and ionization laser beam 22 are vertically intersected on the photodissociation point with the molecular beam that enters reaction chamber respectively after lens focus, laser photolysis makes molecular photodissociation, ionization laser makes photolysis debris ionization, also can not only make molecular photodissociation, but also make photolysis debris ionization with same laser beam; In addition, also be provided with non-magnetic rustproof steel plate and cored slab on every side in ion free flight district, in order to the shielding stray electric field.
In the time of work of the present invention, laboratory sample gas by 11 ejections of the pulse molecular beam valve in the chamber, source 1 after, along a part of gas of central axis, enter reaction chamber 2 behind the aperture collimation through funnel spoon 12, form the pulse molecular beam.At photodissociation point O place, molecular beam and laser photolysis and ionization laser vertical intersect, and laser photolysis makes molecular photodissociation be cleaved into two fragments, and ionization laser makes a kind of fragment be ionized into ion.The fragmention that produces disperses to all directions, forms newton's ball 6.Fragmention has original molecular beam speed V
MB7 and photodissociation when division the speed V in center-of-mass angle that produces
CM8, thus the flying speed of ion actual be above-mentioned two kinds of speed vector and, be referred to as laboratory speed V
Lab9,
。Key of the present invention is: do not add any accelerating field, and the fragmention that the photodissociation photoionization is produced, free flight one segment distance as 3 centimetres or 6 centimetres, arrives ground connection by photodissociation point O and detects aperture plate 23.In detection system, quicken fragmention with weak electric field earlier then, fly to low-voltage aperture plate 24, quicken with highfield again, flight arrives microchannel plate detector 25 and detected, the pulse signal that ion produces is after prime amplifier 3 amplifies, with hyperchannel counter (MCS) or microcomputer configuration data capture card 4 acquisition and recordings, because the molecular photodissociation fragment has different V
CMSo a large amount of fragmention free flights arrive the asynchronism(-nization) that detects aperture plate, be distributed in the different time sections, accumulation through up to ten thousand laser pulse experiments, in the different time sections, each accumulation has different fragmention numbers, obtains the time of flight spectrum of ion, changes fragmented translation power spectrum then as calculated.
Claims (7)
1. molecule photodissolved fragment translational energy spectrometer, it includes a chamber, a source and a reaction chamber, it is characterized in that:
The indoor pulse molecular beam valve that is provided with in described source, the joint of chamber, described source and reaction chamber and be provided with the funnel spoon over against the position of pulse molecular beam valve output terminal; The gas of described pulse molecular beam valve ejection, a part enters reaction chamber and forms molecular beam behind the aperture collimation of funnel spoon;
Be provided with a laser photolysis bundle and an ionization laser beam in the described reaction chamber, this laser photolysis bundle and ionization laser beam are vertically intersected on the photodissociation point with the molecular beam that enters reaction chamber respectively after lens focus; The free flight of photolysis debris ion arrives and detects aperture plate, and is detected through arriving a microchannel plate detector behind a weak electric field area and the forceful electric power place again.
2. molecule photodissolved fragment translational energy spectrometer according to claim 1, it is characterized in that: be provided with a ground connection in the described reaction chamber and detect aperture plate, a low-voltage aperture plate and a high voltage microchannel plate detector, this ground connection is detected and is added with a weak accelerating field between aperture plate and the low-voltage aperture plate, is added with one between this low-voltage aperture plate and the microchannel plate detector and forces fast electric field; This microchannel plate detector also is connected with reaction chamber outer a prime amplifier and a data collector in turn.
3. molecule photodissolved fragment translational energy spectrometer according to claim 1 is characterized in that: the lower end of chamber, described source and reaction chamber is respectively arranged with a cover high vacuum pump.
4. molecule photodissolved fragment translational energy spectrometer according to claim 2 is characterized in that: the lower end of chamber, described source and reaction chamber is respectively arranged with a cover high vacuum pump.
5. according to claim 2 or 4 described molecule photodissolved fragment translational energy spectrometers, it is characterized in that: described data collector is the data collecting card of hyperchannel counter or computer configuration.
6. according to claim 2 or 4 described molecule photodissolved fragment translational energy spectrometers, it is characterized in that: described ground connection is detected aperture plate, the low-voltage aperture plate is columniform aperture plate.
7. molecule photodissolved fragment translational energy spectrometer according to claim 5 is characterized in that: described ground connection is detected aperture plate, the low-voltage aperture plate is columniform aperture plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101443341A CN101191785A (en) | 2006-12-01 | 2006-12-01 | Molecule photodissolved fragment translational energy spectrometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101443341A CN101191785A (en) | 2006-12-01 | 2006-12-01 | Molecule photodissolved fragment translational energy spectrometer |
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| Publication Number | Publication Date |
|---|---|
| CN101191785A true CN101191785A (en) | 2008-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101443341A Pending CN101191785A (en) | 2006-12-01 | 2006-12-01 | Molecule photodissolved fragment translational energy spectrometer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107144360A (en) * | 2017-04-28 | 2017-09-08 | 中国科学院化学研究所 | Low-voltage feeble field accelerates the small-sized photolysis debris translational velocity spectrometer of ion imaging formula |
| CN113514462A (en) * | 2021-04-26 | 2021-10-19 | 浙江师范大学 | Device and method for capturing fine structure of product differential scattering cross section |
-
2006
- 2006-12-01 CN CNA2006101443341A patent/CN101191785A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107144360A (en) * | 2017-04-28 | 2017-09-08 | 中国科学院化学研究所 | Low-voltage feeble field accelerates the small-sized photolysis debris translational velocity spectrometer of ion imaging formula |
| CN107144360B (en) * | 2017-04-28 | 2019-08-02 | 中国科学院化学研究所 | Low-voltage feeble field accelerates the small-sized photolysis debris translational velocity spectrometer of ion imaging formula |
| CN113514462A (en) * | 2021-04-26 | 2021-10-19 | 浙江师范大学 | Device and method for capturing fine structure of product differential scattering cross section |
| CN113514462B (en) * | 2021-04-26 | 2023-05-23 | 浙江师范大学 | Device and method for capturing fine structure of differential scattering cross section of product |
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Open date: 20080604 |