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Hauko, R.; Gomilšek, J. Padežnik; Kodre, A.; Arčon, I.; Aquilanti, G.
Radiation physics and chemistry (Oxford, England : 1993), October 2017, 20171001, Letnik: 139Journal Article
Photoabsorption spectra of gaseous hydrides of 3p elements (PH3, H2S, HCl) are measured in the energy region of photoexcitations pertaining to K edge. The analysis of the edge profile is extended to hydrides of 4p series (GeH4, AsH3, H2Se, HBr) from an earlier experiment, and to published spectra of 2p hydrides (CH4, NH3, H2O, HF) and noble gases Ar, Kr and Ne and SiH4. The edge profiles are modelled with a linear combination of lorentzian components, describing excitations to individual bound states and to continuum. Transition energies and probabilities are also calculated in the non-relativistic molecular model of the ORCA code, in good agreement with the experiment. Edge profiles in the heavier homologues are closely similar, the symmetry of the molecule governs the transitions to the lowest unoccupied orbitals. In 2p series the effect of the strong nuclear potential prevails. Transitions to higher, atomic-like levels remain very much the same as in free atoms. •K-edge absorption profiles of gaseous PH3, H2S, HCl are measured.•Data for 2p and 4p homologues are adopted for comparison.•Spectral features in 3p and 4p series are closely similar, but differ from 2p series.•Experimental data of (2,3,4)p hydrides are compared to data of DFT calculations.•Transition energies and probabilities are extensively tabulated.
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