The effect of autoionization on the HBr+ X2Π3/2,1/2 state photoelectron angular distributions

Hrodmarsson, H. R.; Gans, B.; Boyé-Péronne, S.; Garcia, G. A.; Nahon, L.; Pratt, S. T.; Holland, D. M.P.

doi:10.1016/j.chemphys.2020.110961

The effect of autoionization on the HBr⁺ X²Π_3/2,1/2 state photoelectron angular distributions

Journal Article · Thu Aug 20 00:00:00 EDT 2020 · Chemical Physics

DOI:https://doi.org/10.1016/j.chemphys.2020.110961· OSTI ID:1778019

Hrodmarsson, H. R. ^[1]; Gans, B. ^[2]; Boyé-Péronne, S. ^[2]; Garcia, G. A. ^[1]; Nahon, L. ^[1]; Pratt, S. T. ^[3]; Holland, D. M.P. ^[4]

Synchrotron SOLEIL, Gif-sur-Yvette (France)
Univ. Paris-Saclay, Orsay (France). CNRS, Inst. des Sciences Moleculaires d'Orsay
Argonne National Lab. (ANL), Lemont, IL (United States)
Science and Technology Facilities Council (STFC), Daresbury (United Kingdom). Daresbury Lab.

A double-imaging photoelectron-photoion spectrometer and synchrotron radiation have been used to measure the HBr⁺ X ²Π_3/2 v⁺ = 0, 1, 2 and the ²Π_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 ²Π_3/2 and the ²Π_1/2 spin–orbit components of the ground ionic state. This region encompasses Rydberg states, belonging to series converging onto the upper ²Π_1/2 ionization limit, which may decay by autoionization into the ²Π_3/2 ionization continuum. A detailed study has been performed on the effects of autoionization on the ²Π_3/2 v⁺ = 0 state photoelectron angular distributions. Furthermore, the observed energy dependent variations in the β-values exhibit a regular pattern that correlates with excitation 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 ²Π_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 ²Π_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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1778019

Alternate ID(s):: OSTI ID: 1809371

Journal Information:: Chemical Physics, Journal Name: Chemical Physics Vol. 539; ISSN 0301-0104

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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The effect of autoionization on the HBr+ X2Π3/2,1/2 state photoelectron angular distributions

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