Double photoionization near the inner-atomic shell threshold: dynamics of two-electron emission

The double-electron ejection process after photon absorption by an atom is considered near the inner-atomic shell threshold. The aim of our work is to clarify the dynamics of double-electron emission. For this purpose, it is of primary importance to investigate processes with well-defined final ionic states. The focus of our study in this case is resonant reactions with a low energy for one electron, whereas the energy of the other one is close to the energy of the Auger electron. In this case, important contributions to the cross section of three different processes have to be considered: (1) photoionization of the inner shell followed by Auger decay of the inner vacancy influenced by post-collision interaction (PCI); (2) the PCI capture of the slow photoelectron into a discrete state followed by valence multiplet decay, and (3) the double photoionization of the outer shell. A quantum-mechanical approach has been developed to take into account the contribution to the cross section of amplitudes of all three processes. This model is applied to the case of double photoionization of the Kr atom near the 3d-shell threshold. Our calculation predicts an interference effect in the channel of the 1D final state, whereas in the 3P final state channel the role of interference is negligible.

[1]  K. Ito,et al.  Electron correlation in Xe 4d Auger decay studied by slow photoelectron–Auger electron coincidence spectroscopy , 2006 .

[2]  H. Tanaka,et al.  A study of inner-valence Auger transitions in Ne+ induced by the resonant Auger decay of photoexcited Ne 1s−1np states , 2006 .

[3]  K. Ito,et al.  Coincidence Auger spectroscopy , 2005 .

[4]  L. Avaldi,et al.  Photodouble ionization and the dynamics of electron pairs in the continuum , 2005 .

[5]  K. Ito,et al.  Dynamics of double photoionization near the Ar 2p threshold investigated by threshold electron–Auger electron coincidence spectroscopy , 2005 .

[6]  Hiroshi Tanaka,et al.  Photoelectron recapture as a tool for the spectroscopy of ionic Rydberg states , 2004 .

[7]  P. Lablanquie,et al.  Complete two-electron spectra in double photoionization: the rare gases Ar, Kr, and Xe. , 2003, Physical review letters.

[8]  S. Aksela,et al.  Inherent lifetime widths of Ar 2 p − 1 , Kr 3 d − 1 , Xe 3 d − 1 , and Xe 4 d − 1 states , 2001 .

[9]  Ö. Şimşek,et al.  A new method for the determination of incoherent differential scattering cross sections , 2000 .

[10]  V. Schmidt,et al.  TOPICAL REVIEW: Differential cross sections for photo-double-ionization of the helium atom , 2000 .

[11]  V. Schmidt,et al.  Electron Spectrometry of Atoms using Synchrotron Radiation , 1997 .

[12]  V. Schmidt.  Photoionization of atoms using synchrotron radiation , 1992 .

[13]  F. Larkins,et al.  Valence-multiplet Auger decay of the doubly excited (vp2)nl states of neon and argon , 1992 .

[14]  F. Larkins,et al.  Valence Auger and X-ray participator and spectator processes for neon and argon atoms , 1991 .

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

[16]  D. Varshalovich,et al.  Quantum Theory of Angular Momentum , 1988 .

[17]  S. Sheinerman,et al.  The calculation of the photoionization cross section allowing for the post collision interaction , 1986 .

[18]  S. Sheinerman,et al.  The post collision interaction in the inner-shell photoionisation of Ar and Xe , 1985 .

[19]  S. Sheinerman,et al.  The Postcollision Interaction as a Manifestation of Many-Electron Correlations , 1980 .

[20]  I. I. Sobelʹman,et al.  Atomic spectra and radiative transitions , 1979 .

[21]  H. P. Kelly,et al.  Double photoionization of neon and argon , 1977 .

[22]  R. T. Poe,et al.  Double photoionization of neon , 1975 .

[23]  R. T. Poe,et al.  Correlation Effect and Double Electron Ejection in the Photoabsorption Process , 1971 .