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Iodine K- and L-edge X-ray absorption spectra of HI : the effect of molecular orbitals and core subshellsRobert Hauko,
Jana Padežnik Gomilšek,
Alojz Kodre,
Iztok Arčon,
Uroš Luin, 2024, izvirni znanstveni članek
Opis: Analysis of the recently measured absorption spectra of molecular HI at K and L edges of iodine, in parallel with
previously measured spectra of noble gas Xe and the K edge spectrum of atomic I, is presented. A strong
dependence of some valence multielectron photoexcitation features on the orbital momentum of the core vacancy
is found, attributed to the change of the symmetry of the HI molecule: the shake-up coexcitation of a
valence electron to a free molecular orbital is much stronger at L3 than L1 edge. The effect of angular momentum
of the core hole on the shake processes of deeper multielectron photoexcitations is found negligible. Both HI and
Xe exhibit a much weaker one-electron transition [1s]6p than monatomic I. At the K edge, the strength of
coexcitations of 4d, 4p and 3d subshells in atomic I is close to the HI and Xe. The same is found for HI and Xe at
the L edges, due to a weak contribution of the additional free molecular orbital in HI.
Ključne besede: X-ray absorption spectroscopy, K edge spectrum of atomic I, multielectron photoexcitations (MEPE), core vacancy angular momentum
Objavljeno v RUNG: 09.01.2025; Ogledov: 259; Prenosov: 2
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