Distortion of lineshape and angular distribution of Ar L3(-)M23M23 Auger electrons by post-collision interaction following electron impact ionization

The post-collision interaction (PCI) is investigated in Auger processes induced by electron impact ionization. (An Auger decay of an inner vacancy results in the creation of four charged particles in the final state of such a process.) General formulae allowing for PCI are obtained for energy and angular distributions of the Auger electrons. The expressions obtained beyond the eikonal approximation describe the Auger spectra measured in coincidence and non-coincidence experiments. Results of our approach are applied to the case of the Ar L3-M23M23 Auger spectrum following electron impact ionization. The calculations show the essential PCI distortion of the lineshape and the angular distribution in coincidence measurements; in non-coincidence experiments only the lineshape is disturbed, not the angular distribution. Our results do not show the low-energy structure of the Auger line measured in coincidence with the scattered electrons.

[1]  S. Sheinerman,et al.  PCI influence on angular distribution of Auger and autoionization electrons , 1994 .

[2]  W. Mehlhorn.  Alignment after inner-shell ionization by electron impact near and at threshold , 1994 .

[3]  Macek,et al.  Theory of the angle-dependent autoionization cross section in ion-atom collisions. , 1993, Physical review. A, Atomic, molecular, and optical physics.

[4]  W. Weber,et al.  Alignment of Mg+(L3) ions after electron impact ionization in the range from near threshold to 300 eV , 1993 .

[5]  B. Kammerling,et al.  Angle-dependent post-collision interaction in inner-shell photoionization of xenon , 1993 .

[6]  M. Keane,et al.  Observation of anisotropic PCI effects at high excess energies , 1992 .

[7]  Rudd.  Differential and total cross sections for ionization of helium and hydrogen by electrons. , 1991, Physical review. A, Atomic, molecular, and optical physics.

[8]  B. Lohmann.  Coincidence measurement of Auger lineshapes at two different excess energies , 1991 .

[9]  W. Weber,et al.  Alignment of Ar+ (2p−12P3/2) ions after electron impact ionisation in the range 1 keV to 268 eV , 1991 .

[10]  Suzuki,et al.  Post-collision interaction in Auger-electron emission of rare-gas atoms following electron-impact ionization. , 1991, Physical review. A, Atomic, molecular, and optical physics.

[11]  Lahmam-Bennani,et al.  Electron-impact double ionization of argon studied by double and triple coincidence techniques: The first (e,3e) experiment. , 1989, Physical review letters.

[12]  S. Sheinerman,et al.  Post-collision interaction in atomic processes , 1989 .

[13]  J. Macek,et al.  Theory of emission-angle-dependent Auger transitions in ion-atom collisions , 1989 .

[14]  Meyer,et al.  Observation of Coulomb focusing of autoionization electrons produced in low-energy He++He collisions. , 1989, Physical review letters.

[15]  F. Koike.  Theory of post-collision interaction at high excess energies , 1988 .

[16]  S. Sheinerman,et al.  Resonant scattering with low-velocity outgoing charged particles , 1988 .

[17]  W. Sandner.  Post collision interaction at high impact energies , 1986 .

[18]  L. Avaldi,et al.  PCI effects in (e,e' Auger) and (e,2e) cross sections: Ar 2p , 1986 .

[19]  W. Mehlhorn,et al.  Post-collision interaction and the Auger lineshape , 1986 .

[20]  L. Liljeby,et al.  Observation of high-order electric multipoles in convoy electron angular distributions , 1986 .

[21]  W. Sander,et al.  Coincident angular correlations between Auger electrons and scattered electrons , 1984 .

[22]  E. C. Sewell,et al.  Auger electron lineshapes measured in coincidence with scattered electrons , 1984 .

[23]  I. Percival,et al.  Classical Theory of Atomic Scattering , 1968 .