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

Abstract

A double-imaging photoelectron-photoion spectrometer and synchrotron radiation have been used to measure the HBr+ X 2Π3/2 v+ = 0, 1, 2 and the 2Π1/2 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 2Π3/2 and the 2Π1/2 spin–orbit components of the ground ionic state. This region encompasses Rydberg states, belonging to series converging onto the upper 2Π1/2 ionization limit, which may decay by autoionization into the 2Π3/2 ionization continuum. A detailed study has been performed on the effects of autoionization on the 2Π3/2 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 2Π3/2 v+ = 0 state photoelectron anisotropy parameter are compared to previously reported theoretical predictions and to earlier studies of the Kr+more » 4p5 2P3/2 state β-parameter. The threshold photoelectron spectrum of the X 2Π3/2 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.« less

Authors:
 [1];  [2];  [2];  [1];  [1];  [3];  [4]
+ Show Author Affiliations
  1. Synchrotron SOLEIL, Gif-sur-Yvette (France)
  2. Univ. Paris-Saclay, Orsay (France). CNRS, Inst. des Sciences Moleculaires d'Orsay
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
  4. Science and Technology Facilities Council (STFC), Daresbury (United Kingdom). Daresbury Lab.
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1778019
Alternate Identifier(s):
OSTI ID: 1809371
Grant/Contract Number:  
AC02-06CH11357; 20170891
Resource Type:
Accepted Manuscript
Journal Name:
Chemical Physics
Additional Journal Information:
Journal Volume: 539; Journal ID: ISSN 0301-0104
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Autoionizing Rydberg states; Hydrogen bromide; Photoelectron angular distributions; Threshold photoelectron spectrum

Citation Formats

Hrodmarsson, H. R., Gans, B., Boyé-Péronne, S., Garcia, G. A., Nahon, L., Pratt, S. T., and Holland, D. M.P. The effect of autoionization on the HBr+ X2Π3/2,1/2 state photoelectron angular distributions. United States: N. p., 2020. Web. doi:10.1016/j.chemphys.2020.110961.
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Hrodmarsson, H. R., Gans, B., Boyé-Péronne, S., Garcia, G. A., Nahon, L., Pratt, S. T., & Holland, D. M.P. The effect of autoionization on the HBr+ X2Π3/2,1/2 state photoelectron angular distributions. United States. https://doi.org/10.1016/j.chemphys.2020.110961
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Hrodmarsson, H. R., Gans, B., Boyé-Péronne, S., Garcia, G. A., Nahon, L., Pratt, S. T., and Holland, D. M.P. Thu . "The effect of autoionization on the HBr+ X2Π3/2,1/2 state photoelectron angular distributions". United States. https://doi.org/10.1016/j.chemphys.2020.110961. https://www.osti.gov/servlets/purl/1778019.
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@article{osti_1778019,
title = {The effect of autoionization on the HBr+ X2Π3/2,1/2 state photoelectron angular distributions},
author = {Hrodmarsson, H. R. and Gans, B. and Boyé-Péronne, S. and Garcia, G. A. and Nahon, L. and Pratt, S. T. and Holland, D. M.P.},
abstractNote = {A double-imaging photoelectron-photoion spectrometer and synchrotron radiation have been used to measure the HBr+ X 2Π3/2 v+ = 0, 1, 2 and the 2Π1/2 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 2Π3/2 and the 2Π1/2 spin–orbit components of the ground ionic state. This region encompasses Rydberg states, belonging to series converging onto the upper 2Π1/2 ionization limit, which may decay by autoionization into the 2Π3/2 ionization continuum. A detailed study has been performed on the effects of autoionization on the 2Π3/2 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 2Π3/2 v+ = 0 state photoelectron anisotropy parameter are compared to previously reported theoretical predictions and to earlier studies of the Kr+ 4p5 2P3/2 state β-parameter. The threshold photoelectron spectrum of the X 2Π3/2 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.},
doi = {10.1016/j.chemphys.2020.110961},
journal = {Chemical Physics},
number = ,
volume = 539,
place = {United States},
year = {Thu Aug 20 00:00:00 EDT 2020},
month = {Thu Aug 20 00:00:00 EDT 2020}
}
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