A New Experimental Study of Multiple Ionization in Noble Gases by Electron and Photon Impact
The main topics of this summer school are effects which are due to electron correlations in atoms. One of the most powerful methods used to study the influence of electron correlations is multiple ionization of rare gases produced by electron or photon impact. This is due to the fact that the operator which causes the ionization process is a one-particle operator. Therefore, a theory that takes into account neither electron correlation nor rearrangement of the electron orbitals after the ionization process will allow only singly charged ions. When secondary processes as for instance the Auger effect are excluded, then the appearance of multiply charged ions is due to electron correlations and rearrangement of the electrons. This clear statement is true only for the photon impact experiment. For electron impact, it is valid only in first Born approximation and even then the large range of momentum transfers in the collision process makes the interpretation more difficult.
KeywordsElectron Correlation Ionization Cross Section Multiple Ionization Dipole Matrix Element Intrinsic Error
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