A momentum imaging microscope for dissociative electron attachment

We describe an experimental approach to image the three-dimensional (3D) momentum distribution of the negative ions arising from dissociative electron attachment (DEA). The experimental apparatus employs a low energy pulsed electron gun, an effusive gas source and a 4π solid-angle ion momentum imagi...

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Bibliographic Details
Published in:Review of scientific instruments 2012-02, Vol.83 (2), p.023106-023106-7
Main Authors: Adaniya, H., Slaughter, D. S., Osipov, T., Weber, T., Belkacem, A.
Format: Article
Language:English
Subjects:
Anions
Electron attachment
Electrostatics
Imaging spectrometers
Ion extraction
Microscopes
Three dimensional
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Summary:We describe an experimental approach to image the three-dimensional (3D) momentum distribution of the negative ions arising from dissociative electron attachment (DEA). The experimental apparatus employs a low energy pulsed electron gun, an effusive gas source and a 4π solid-angle ion momentum imaging spectrometer consisting of a pulsed ion extraction field, an electrostatic lens, and a time- and position-sensitive detector. The time-of-flight and impact position of each negative ion are measured event by event in order to image the full 3D ion momentum sphere. The system performance is tested by measuring the anion momentum distributions from two DEA resonances, namely H − from H 2 O − ( 2 B 1 ) and O − from \documentclass[12pt]{minimal}\begin{document}${\rm O}_2^-$\end{document} O 2 − ( 2 Π u ). The results are compared with existing experimental and theoretical data.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.3685244