Structure near autoionizing energies in the excitation of bound states of helium, neon and argon by electron impact

Cross sections for the excitation of bound states of atoms by electron impact have been found to contain structures at incident energies near to the energies of short-lived autoionizing states of the target atoms. These structures look superficially like resonances, but in fact they seem to be caused by a post-collision interaction between inelastically scattered and ejected electrons. Examples are given of these structures in He, Ne and Ar. A quantum-mechanical model, which is termed 'shake-down', is advanced to explain these structures and comparison is made with the experimental data.

[1]  P. Hicks,et al.  Autoionizing transitions in neon studied by low-energy electron impact , 1975 .

[2]  P. Hicks,et al.  Ejected electron spectroscopy of autoionizing states excited by low energy electron impact , 1975 .

[3]  F. H. Read.  Doppler and other broadening effects in electron scattering experiments , 1975 .

[4]  G. Nienhuis,et al.  The effect of post-collision interaction in n3S excitation of helium by electrons , 1975 .

[5]  G. Nienhuis,et al.  Post-collision interaction in electron-helium scattering , 1974 .

[6]  F. H. Read,et al.  Phenomena associated with near-threshold excitation of autoionizing levels of helium by electron impact , 1974 .

[7]  F. H. Read,et al.  Displacements of electron ejection energies in near-threshold excitation of autoionizing levels of helium by electron impact , 1974 .

[8]  J. Carette,et al.  High Resolution Electron Spectrometry in Neon , 1974 .

[9]  G. Schulz.  Resonances in electron impact on atoms , 1973 .

[10]  G. Gerber,et al.  Ionization processes in slow collisions of heavy particles II. Symmetrical systems of the rare gases He, Ne, Ar, Kr , 1973 .

[11]  E. Bolduc,et al.  Autoionizing 2s22p43s3l States of Ne and Related Ne− Resonances , 1972 .

[12]  G. Schulz,et al.  Electron Transmission Spectroscopy: Rare Gases , 1972 .

[13]  F. H. Read,et al.  Electron impact studies of autoionizing states in neon and helium , 1972 .

[14]  F. H. Read,et al.  A new electron-photon coincidence method for the measurement of lifetimes in atoms and molecules , 1971 .

[15]  R. Madden,et al.  Resonances in the Photo-ionization Continuum of Ar i (20-150 eV) , 1969 .

[16]  W. R. Garrett,et al.  AUTOIONIZING AND NEGATIVE-ION STATES IN NEON. , 1969 .

[17]  H. W. Berry,et al.  Electron Energy Distributions from Ionizing Collisions of Helium and Neon Ions with Helium , 1966 .

[18]  J. Bearden,et al.  Atomic energy levels , 1965 .