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Title: Zero degree target electron spectroscopy: Double excitation, autoionization of helium in fast e, H{sup +}, He{sup +}, and He{sup 2+} collisions

Abstract

The authors have measured zero degree high-resolution spectra and double differential cross sections (DDCS) for double - excitation-autoionization of Helium atoms. They have also measured direct ionization DDCS at zero degree observation angle. The cross sections are absolutely calibrated. Electrons from the energy 150 to 1000 eV, protons from 100 keV to 1.5 MeV, He{sup +} from 400 keV to 1.5 MeV, and He{sup 2+} from 400 keV to 1.6 MeV were used as projectiles. The zero degree observation angle provides a unique opportunity to maximize the interaction between the emitted electron, the ionized target atom, and the charged projectile particles. The doubly excited autoionizing (2lnl`) states of He have been observed as a function of the collision conditions such as impact velocity, projectile charge sign, and type of projectile, specifically for the dominating (2p{sup 2}){sup 1}D {r_arrow} (ls{epsilon}d) and (2s2p){sup 1}P{sup 0} {r_arrow} (ls{epsilon}p) channels.

Authors:
; ;  [1]
  1. Univ. of Nevada, Reno, NV (United States)
Publication Date:
OSTI Identifier:
199651
Report Number(s):
CONF-941129-
TRN: 95:005652-0143
Resource Type:
Conference
Resource Relation:
Conference: 13. international conference on the application of accelerators in research and industry, Denton, TX (United States), 7-10 Nov 1994; Other Information: PBD: 1994; Related Information: Is Part Of Thirteenth international conference on the application of accelerators in research and industry; Duggan, J.L.; Morgan, I.L. [eds.]; PB: 201 p.
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; HELIUM; ELECTRON-ATOM COLLISIONS; PROTON REACTIONS; ION-ATOM COLLISIONS; HELIUM IONS; EV RANGE 100-1000; KEV RANGE 100-1000; MEV RANGE 01-10; DIFFERENTIAL CROSS SECTIONS; AUTOIONIZATION; COULOMB EXCITATION

Citation Formats

Wang, H, Bruch, R, and Yan, Y. Zero degree target electron spectroscopy: Double excitation, autoionization of helium in fast e, H{sup +}, He{sup +}, and He{sup 2+} collisions. United States: N. p., 1994. Web.
Wang, H, Bruch, R, & Yan, Y. Zero degree target electron spectroscopy: Double excitation, autoionization of helium in fast e, H{sup +}, He{sup +}, and He{sup 2+} collisions. United States.
Wang, H, Bruch, R, and Yan, Y. 1994. "Zero degree target electron spectroscopy: Double excitation, autoionization of helium in fast e, H{sup +}, He{sup +}, and He{sup 2+} collisions". United States.
@article{osti_199651,
title = {Zero degree target electron spectroscopy: Double excitation, autoionization of helium in fast e, H{sup +}, He{sup +}, and He{sup 2+} collisions},
author = {Wang, H and Bruch, R and Yan, Y},
abstractNote = {The authors have measured zero degree high-resolution spectra and double differential cross sections (DDCS) for double - excitation-autoionization of Helium atoms. They have also measured direct ionization DDCS at zero degree observation angle. The cross sections are absolutely calibrated. Electrons from the energy 150 to 1000 eV, protons from 100 keV to 1.5 MeV, He{sup +} from 400 keV to 1.5 MeV, and He{sup 2+} from 400 keV to 1.6 MeV were used as projectiles. The zero degree observation angle provides a unique opportunity to maximize the interaction between the emitted electron, the ionized target atom, and the charged projectile particles. The doubly excited autoionizing (2lnl`) states of He have been observed as a function of the collision conditions such as impact velocity, projectile charge sign, and type of projectile, specifically for the dominating (2p{sup 2}){sup 1}D {r_arrow} (ls{epsilon}d) and (2s2p){sup 1}P{sup 0} {r_arrow} (ls{epsilon}p) channels.},
doi = {},
url = {https://www.osti.gov/biblio/199651}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Dec 31 00:00:00 EST 1994},
month = {Sat Dec 31 00:00:00 EST 1994}
}

Conference:
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