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Coherent excitation of autoionizing resonances

Description: An electron-electron coincidence [or (e,2e)] technique was used to investigate atomic ionization by electron impact in the neighborhood of autoionizing resonances. Differing binary (I{sup +}) and recoil (I{sup -}) lobe intensities in coplanar (e,2e) ejected-electron angular distributions were analyzed in terms of interference cross-terms, between opposite parity final-state continua, that change sign when {theta}{sub ej} {yields} {theta}{sub ej} + 180{sup o} 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 -}) of (e,2e) energy spectra measured at ejected-electron angles 180{sup o} apart.
Date: October 3, 2002
Creator: Martin, N.L.S.
Partner: UNT Libraries Government Documents Department

Coherent excitation of autoionizing resonances by electron impact

Description: Interference effects caused by coherent population by electron impact, of cadmium autoionizing levels and continua of differing total angular momentum and parity. The work provides information both the excitation mechanism by charged particle impact and the spectroscopy of autoionizing levels.
Date: June 1, 1993
Creator: Martin, N.L.S.
Partner: UNT Libraries Government Documents Department

Coherent excitation of autoionizing resonances by electron impact. Progress report, January 1993--January 1994

Description: Interference effects caused by coherent population by electron impact, of cadmium autoionizing levels and continua of differing total angular momentum and parity. The work provides information both the excitation mechanism by charged particle impact and the spectroscopy of autoionizing levels.
Date: June 1, 1993
Creator: Martin, N. L. S.
Partner: UNT Libraries Government Documents Department

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

Description: 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.
Date: December 1, 1995
Creator: Martin, N.L.S.
Partner: UNT Libraries Government Documents Department

Coherent excitation of autoionizing resonances by electron impact. Annual report, September 1991 - January 1993

Description: This report describes experimental investigations of interference effects, in the Group IIB transition metal atoms Zn, Cd, and Hg, caused by the coherent excitation, by electron impact, of autoionizing levels of differing total angular momentum. The work will provide information on both the excitation mechanism by charged particle impact and the spectroscopy of autoionizing levels. 4 refs., 2 figs.
Date: July 1, 1992
Creator: Martin, N.L.S.
Partner: UNT Libraries Government Documents Department