Aligment in low-energy photionization

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Abstract
Ions or excited states generated by the absorption of a photon just above or below an inner shell threshold can be aligned if the angular momentum of the excited state is greater than 1/2. These states typically decay by electron emission, and the alignment, which can be a sensitive probe of the electron correlation in the system, is reflected in an anisotropy in the angular distribution of the Auger electrons. Examples of the consequences of this behavior will be given from high resolution measurements of the angular distribution for Auger electrons at selected phonon energies corresponding to excitations of the 3d electrons in Kr and 4d electrons in Xe. Special attention will be given to the off‐resonant absorption very close to the d5/2 threshold.

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