The effect of autoionization on the HBr+ X 2Π3/2,1/2 state photoelectron angular distributions
| Autor: | Bérenger Gans, Séverine Boyé-Péronne, Laurent Nahon, Gustavo A. Garcia, Stephen T. Pratt, H.R. Hrodmarsson, D.M.P. Holland |
|---|---|
| Přispěvatelé: | Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), SOLEIL Synchrotron, L'Orme des Merisiers, 91198 Gif-sur-Yvette, France |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010304 chemical physics
Photoemission spectroscopy Hydrogen bromide General Physics and Astronomy Photon energy 010402 general chemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound symbols.namesake chemistry Autoionization Ionization 0103 physical sciences Physics::Atomic and Molecular Clusters Rydberg formula symbols Physics::Atomic Physics [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] Physical and Theoretical Chemistry Atomic physics Anisotropy Excitation |
| Zdroj: | Chemical Physics Chemical Physics, Elsevier, 2020, 539, pp.110961. ⟨10.1016/j.chemphys.2020.110961⟩ |
| ISSN: | 0301-0104 |
| DOI: | 10.1016/j.chemphys.2020.110961⟩ |
| Popis: | International audience; A double-imaging photoelectron-photoion spectrometer and synchrotron radiation have been used to measure the HBr + X 2 Π 3/2 v + = 0, 1, 2 and the 2 Π 1/2 v + = 0 state photoelectron angular distributions, as characterized by the anisotropy parameter β, the total ion yield, and the threshold photoelectron spectrum. Particular attention has been focussed on the photon energy range between the 2 Π 3/2 and the 2 Π 1/2 spin-orbit components of the ground ionic state. This region encompasses Rydberg states, belonging to series converging onto the upper 2 Π 1/2 ionization limit, which may decay by autoionization into the 2 Π 3/2 ionization continuum. A detailed study has been performed on the effects of autoionization on the 2 Π 3/2 v + = 0 state photoelectron angular distributions. The observed energy dependent variations in the β-values exhibit a regular pattern that correlates with ex-citation into members of a very broad d-type Rydberg series. Additional rapid variations in the β-parameters, which occur over a narrow energy range, appear to coincide with sharp autoionizing Rydberg states belonging to s, p and d series. The present experimental results for the HBr + X 2 Π 3/2 v + = 0 state photoelectron anisotropy parameter are compared to previously reported theoretical predictions and to earlier studies of the Kr + 4p 5 2 P 3/2 state β-parameter. The threshold photoelectron spectrum of the X 2 Π 3/2 v + = 0 band exhibits partially resolved rotational structure. A simulation of this structure yields an ionization threshold of 11.6673 ± 0.0010 eV, which is consistent with previous measurements. |
| Databáze: | OpenAIRE |
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