Post-collision interaction effects following 4p-shell ionization of Xe

Abstract

Yield spectra of multiply charged ions in coincidence with threshold electrons (Ekin⩽0.03 eV) have been measured near the 4p-shell ionization region of Xe. The coincidence spectra of Xe3+ and Xe4+ ions as a function of photon energy exhibit characteristic profiles induced by post-collision interactions in Auger cascades following 4p-shell threshold ionization of Xe. Peaks of the profiles shift from the nominal 4p-shell threshold, and those shapes are asymmetric and broadened. The profiles have the same peak-shifts and the same peak-widths in both Xe3+ and Xe4+ coincidence spectra. Based on the properties of the profiles, it is concluded that both of these ions result from two-step Auger cascades. Furthermore, it is found that Auger shake-off (i.e. double Auger) decays play a significant role in the cascades following 4p-shell ionization of Xe.

Antiproton, proton and electron impact multiple ionization of rare gases

“…These processes were extensively studied by Carlson, Krause and co-workers [33][34][35][36][37][38] in photoionization. The advent of new experimental techniques in photon-atom research in the last two decades has contributed to a detailed knowledge of the Auger-type processes, the intermediate steps and cascades [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53].…”

Influence of double Auger decay on low-energy 3dphotoelectrons of krypton

“…In the case of inner-shell photoionization followed by DA decay, PCI implies the interaction of the emitted photoelectron with the two subsequent Auger electrons and with the field of the ion, which varies during the Auger decay. Previously, PCI effects in DA processes have been investigated experimentally by means of threshold photoelectron yields measured in the vicinity of inner-shell vacancies: Kr 1s −1 , Kr 2p −1 , Kr 3p −1 , Ar 1s −1 , Ar 2p −1 , Xe 4p −1 , and Xe 4d −1 [9][10][11][12][13][14][15][16][17][18]. Also an investigation of PCI-distorted photoelectron lines associated with DA decay and measured in coincidence with the two ejected Auger electrons has been carried out more recently for the case of Ar 2p photoionization [19].…”

CDW-EIS calculations for multiple ionization of Ne, Ar, Kr and Xe by the impact of H+and He+, including post-collisional electron emission

“…Compilation of experimental[2][3][4][5][6][7][18][19][20][21][22][23][24][25][26][27][28] and calculated[43,47] photoionization branching ratios. F μ,i is the yield of single photoionization of the μ-subshell followed by the post-collisional emission of i electrons from the outer shells, with the final charge state being i + 1.…”