A Three-Dimensional Velocity-Map Imaging Setup Designed for Crossed Ion-Molecule Scattering Studies

Guo-dong Zhang; Li-chang Guan; Zi-feng Yan; Min Cheng; Hong Gao

doi:10.1063/1674-0068/cjcp2012219

Volume 34 Issue 1

Feb. 2021

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Article Navigation > Chinese Journal of Chemical Physics > 2021 > 34(1): 71-80

Guo-dong Zhang, Li-chang Guan, Zi-feng Yan, Min Cheng, Hong Gao. A Three-Dimensional Velocity-Map Imaging Setup Designed for Crossed Ion-Molecule Scattering Studies[J]. Chinese Journal of Chemical Physics , 2021, 34(1): 71-80. doi: 10.1063/1674-0068/cjcp2012219

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Guo-dong Zhang, Li-chang Guan, Zi-feng Yan, Min Cheng, Hong Gao. A Three-Dimensional Velocity-Map Imaging Setup Designed for Crossed Ion-Molecule Scattering Studies[J]. Chinese Journal of Chemical Physics , 2021, 34(1): 71-80. doi: 10.1063/1674-0068/cjcp2012219

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A Three-Dimensional Velocity-Map Imaging Setup Designed for Crossed Ion-Molecule Scattering Studies

doi: 10.1063/1674-0068/cjcp2012219

Guo-dong Zhang^{a, b, †},
Li-chang Guan^{a, b, †},
Zi-feng Yan^c,
Min Cheng^{a, b},
Hong Gao^{a, b
,
,}

a.
Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
b.
University of Chinese Academy of Sciences, Beijing 100049, China
c.
Beijing Success Technology Co. ltd, Beijing 100102, China

More Information

Corresponding author: Gao Hong, E-mail: honggao2017@iccas.ac.cn
Received Date: 2020-12-27
Accepted Date: 2021-01-18

Available Online: 2021-02-04

Publish Date: 2021-02-27

Abstract

Abstract

In this study, we report the design and simulation of an electrostatic ion lens system consisting of 22 round metal plates. The opening of the extractor plate is covered with metal mesh, which is for shielding the interaction region of the lens system from the high DC voltages applied to all other plates than the repeller and extractor plates. The Simion simulation shows that both velocity-mapping and time focusing can be achieved simultaneously when appropriate voltages are applied to each of the plates. This makes the ion lens system be able to focus large ionic volumes in all three dimensions, which is an essential requirement for crossed ion-molecule scattering studies. A three-dimensional ion velocity measurement system with multi-hit and potential multi-mass capability is built, which consists of a microchannel plate (MCP), a P47 phosphor screen, a CMOS camera, a fast photomultiplier tube (PMT), and a high-speed digitizer. The two velocity components perpendicular to the flight axis are measured by the CMOS camera, and the time-of-flight, from which the velocity component along the flight axis can be deduced, is measured by the PMT. A Labview program is written to combine the two measurements for building the full three-dimensional ion velocity in real time on a frame-by-frame basis. The multi-hit capability comes from the fact that multiple ions from the camera and PMT in the same frame can be correlated with each other based on their various intensities. We demonstrate this by using the photodissociation of CH₃I at 304 nm.
- Three-dimensional image,
- Velocity-mapping,
- Time-focusing,
- Ion-molecule scattering,
- Photodissociation

^†These authors contributed equally to this work.

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References(36)

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