Coherent excitation of autoionizing resonances

Martin, N.L.S.

University of Kentucky Research Foundation, Lexington, KY (United States)

关键词: Parity;    Interference Electron-Atom Collisions;    Angular Distribution;    Excitation;    Resonances;   

DOI  :  10.2172/808503
RP-ID  :  None
RP-ID  :  FG02-91ER14214
RP-ID  :  808503

美国|英语

来源: UNT Digital Library

【 摘 要 】

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.