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| Home > Publications database > Effects of the molecular potential on coexcitations of valence electrons in the $K$-shell photoeffect of $3p$ and $4p$ elements |
| Journal Article | PUBDB-2019-03227 |
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2019
APS
Woodbury, NY
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Please use a persistent id in citations: doi:10.1103/PhysRevA.99.062501 doi:10.3204/PUBDB-2019-03227
Abstract: Photoabsorption spectra of gaseous hydrides of $3p(PH_{3},H_{2}S, HCl)$ and $4p$ elements $(GeH_{4},AsH_{3},H_{2}Se,HBr)$ are measured in the energy region within 50 eV above the $K$ edge, to study coexcitations of valenceelectrons by photoeffect in the $K$ shell. The analysis of the valence coexcitations is extended to Ar, Kr, and $SiH_4$. Relative probabilities and energies of states in the individual coexcitation channels are recovered bymodeling the spectral features with a minimal ansatz based on the features in the contiguous noble gas. Theextracted parameters are compared to the results of theoretical calculations for molecules (ORCAcode) andfree atoms (Hartree-Fock code). The experimental results confirm that the valence coexcitations in the $3p$ and $4p$ hydride molecules can be satisfactorily described by a two-step process, with the shake of the outer electronfollowing the excitation of the core electron. The total probability—relative to the $K$-edge jump—of the shake-upprocesses shows a steady decrease from 19% in Si to 14% in Cl, and from 15% in Ge to 12% in Br. Theexperimental values for Ar (12%) and Kr (10%) are in accord with the trend. The dominant contribution isthe transition to quasiatomic orbitals, in contrast with the deeper coexcitation channels in hydride moleculeswhere transition to molecular orbitals prevails.
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