Using Recoil Ion Momentum Spectroscopic Techniques to Study Positron Impact Ionization of Atoms

Abstract

An experimental apparatus that is capable of providing doubly and triply differential ionization cross sections for low-energy positron-atom collisions is described. The experimental technique is that of recoil ion momentum spectroscopy where the positions and flight times of the ionization products are measured. From these data, information about their momentum components is deduced. The present apparatus is capable of detecting both the recoil target ion and low-energy ionized electrons with 4π detection efficiencies. Higher energy electrons are detected with lower efficiency. Doubly differential ionization information is obtained by detection of any one of the particles whereas triply differential cross sections are obtained by coincidence detection of any two of the three particles. Experiments are planned for 50 - 500 eV positron impact on helium.

Department(s)

Physics

Keywords and Phrases

Atoms; Ionization; Positron

International Standard Serial Number (ISSN)

1662-9752; 0255-5476

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Trans Tech Publications, All rights reserved.

Publication Date

01 Jan 1997

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