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[en] The polarisation and angular correlation relations for the electron-photon-photon coincidence event of an atomic system, which is excited by electron impact and subsequently decays spontaneously via a two-photon cascade, is derived. The expressions for the two-photon and the electron-second-photon coincidence measurements are deduced from the general formulae. As a special case the cascade n = 3 → n = 1 of hydrogen excited by electron impact is considered. (author)
Journal
Journal of Physics. B, Atomic and Molecular Physics; ISSN 0022-3700; 
; CODEN JPAMA; v. 19(22); p. 3633-3647
; CODEN JPAMA; v. 19(22); p. 3633-3647