Abstract
The photoionization branching ratios of spin–orbit doublets are studied both experimentally and theoretically at energies several keV above threshold. The results show significant relativistic effects for Ar 2p in the autoionizing region below the 1s threshold, and large many-body effects for Xe 3d and 4d in the vicinity of the L-shell thresholds. The branching ratios in Xe are also found to vary significantly over very broad multi-keV energy regions both above and below the inner-shell thresholds. In addition, the Ar 2p study confirms experimentally the decades-old theoretical prediction that the nonresonant branching ratio does not approach the statistical (nonrelativistic) value, and, in fact, progressively diverges from statistical with increasing photon energy.
Highlights
Photoionization studies have long been important tools in the investigation of the properties of atomic, molecular and condensed matter systems owing to the facts that the coupling of the photon to the target electrons is weak, and the photon disappears after the interaction
The increased resolution has allowed the measurement of the ratio of the photoionization cross sections of the two components of spin–orbit doublets, subshells split by the spin–orbit interaction
The experimental results on Ar over a broad range of photon energies confirmed earlier theoretical predictions [4,5,6] that, at the higher energies, the branching ratios were found to diverge from the statistical ratios as the energy increased, rather than approaching the statistical value
Summary
Universite Paris-Saclay, CNRS, Institut des Sciences Moleculaires d’Orsay, 91405, Orsay, France. 11Present address: Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 S Cass Avenue, Lemont, IL 60439, USA. ∗ Author to whom any correspondence should be addressed. Universite Paris-Saclay, CNRS, Institut des Sciences Moleculaires d’Orsay, 91405, Orsay, France. ∗ Author to whom any correspondence should be addressed.
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