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Title: Coherent excitation of autoionizing resonances by electron impact. Annual report, March 1995 - April 1996

Abstract

Experimental investigations are being carried out into interference effects caused by the coherent population, by electron impact, of autoionizing levels and continua of differing total angular momentum and parity. The work provides information on the atomic excitation and ionization mechanisms by charged particle impact. The experimental technique being used is electron-electron coincidence [or (e, 2e)] spectrometry. Differing binary (I{sup +}) and recoil (I{sup -}) lobe intensities in coplanar (e, 2e) ejected-electron angular distributions may be modeled by interference cross-terms, between opposite parity final-state continua, that change sign when {theta}{sub ej} {r_arrow} {theta}{sub ej} + 180{degrees} in the angular distributions. The magnitude of these cross-terms varies rapidly with ejected-electron energy across overlapping autoionizing resonances. The energy variation in the interference terms may be examined by obtaining the sum (I{sup +} + I{sup -}) and difference (I{sup +} - I{sup -}) between (e, 2e) energy spectra measured at ejected-electron angles 180{degrees} apart. 5 refs., 1 fig.

Authors:
Publication Date:
Research Org.:
Kentucky Univ., Lexington, KY (United States). Dept. of Physics and Astronomy
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (United States)
OSTI Identifier:
466786
Report Number(s):
DOE/ER/14214-4
ON: DE97005199
DOE Contract Number:  
FG05-91ER14214
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Dec 1995
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; CADMIUM; ELECTRON-ATOM COLLISIONS; EXCITATION; AUTOIONIZATION; HELIUM; INTERFERENCE; ENERGY LEVELS; EXPERIMENTAL DATA; PROGRESS REPORT

Citation Formats

Martin, N.L.S.. Coherent excitation of autoionizing resonances by electron impact. Annual report, March 1995 - April 1996. United States: N. p., 1995. Web. doi:10.2172/466786.
Martin, N.L.S.. Coherent excitation of autoionizing resonances by electron impact. Annual report, March 1995 - April 1996. United States. doi:10.2172/466786.
Martin, N.L.S.. Fri . "Coherent excitation of autoionizing resonances by electron impact. Annual report, March 1995 - April 1996". United States. doi:10.2172/466786. https://www.osti.gov/servlets/purl/466786.
@article{osti_466786,
title = {Coherent excitation of autoionizing resonances by electron impact. Annual report, March 1995 - April 1996},
author = {Martin, N.L.S.},
abstractNote = {Experimental investigations are being carried out into interference effects caused by the coherent population, by electron impact, of autoionizing levels and continua of differing total angular momentum and parity. The work provides information on the atomic excitation and ionization mechanisms by charged particle impact. The experimental technique being used is electron-electron coincidence [or (e, 2e)] spectrometry. Differing binary (I{sup +}) and recoil (I{sup -}) lobe intensities in coplanar (e, 2e) ejected-electron angular distributions may be modeled by interference cross-terms, between opposite parity final-state continua, that change sign when {theta}{sub ej} {r_arrow} {theta}{sub ej} + 180{degrees} in the angular distributions. The magnitude of these cross-terms varies rapidly with ejected-electron energy across overlapping autoionizing resonances. The energy variation in the interference terms may be examined by obtaining the sum (I{sup +} + I{sup -}) and difference (I{sup +} - I{sup -}) between (e, 2e) energy spectra measured at ejected-electron angles 180{degrees} apart. 5 refs., 1 fig.},
doi = {10.2172/466786},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 1995},
month = {Fri Dec 01 00:00:00 EST 1995}
}

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