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Accurate depolarization ratio measurements for all diatomic hydrogen isotopologues

T. M James, M Schlösser, S Fischer, M Sturm, B Bornschein, R. J Lewis, H. H Telle, Helmut Telle, Timothy James

Journal of Raman Spectroscopy, Volume: 44, Issue: 6, Pages: 857 - 865

Swansea University Authors: Helmut Telle, Timothy James

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DOI (Published version): 10.1002/jrs.4283

Abstract

The Raman depolarization ratios for individual Q1(J”) branch lines of all diatomic hydrogen isotopologues – H2, HD, D2, HT, DT, and T2 – were measured, for all rotational levels with population larger than 1/100 relative to the Boltzmann maximum at room temperature. For these measurements, the exper...

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Published in: Journal of Raman Spectroscopy
ISSN: 0377-0486
Published: 2013
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URI: https://cronfa.swan.ac.uk/Record/cronfa14493
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first_indexed 2013-07-23T12:12:19Z
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spelling 2013-06-18T11:42:26.5958369 v2 14493 2013-03-27 Accurate depolarization ratio measurements for all diatomic hydrogen isotopologues 7f645d598f0afb573309bc5f86ea46fa Helmut Telle Helmut Telle true false 8a92e003a0ce92f67bba506d7f03344f Timothy James Timothy James true false 2013-03-27 FGSEN The Raman depolarization ratios for individual Q1(J”) branch lines of all diatomic hydrogen isotopologues – H2, HD, D2, HT, DT, and T2 – were measured, for all rotational levels with population larger than 1/100 relative to the Boltzmann maximum at room temperature. For these measurements, the experimental setup normally used for the monitoring of the tritiated hydrogen molecules at the KArlsruhe TRItium Neutrino experiment was adapted to optimally control the excitation laser power and polarization, and to precisely define the Raman light collection geometry. The measured Raman depolarization values were compared to theoretical values, which are linked to polarizability tensor quantities. For this, the ‘raw data’ were corrected taking into account distinct aspects affecting Raman depolarization data, including (1) excitation polarization impurities; (2) extended Raman excitation volumes; and (3) Raman light collection over finite solid angles. Our corrected depolarization ratios of the hydrogen isotopologues agree with the theoretical values (based on ab initio quantum calculations by R.J. LeRoy, University of Waterloo, Canada) to better than 5% for nearly all of the measured Q1(J”) lines, with 1-sigma confidence level. The results demonstrate that reliable, accurate Raman depolarization ratios can be extracted from experimental measurements, which may be substantially distorted by excitation polarization impurities and by geometrical effects. Journal Article Journal of Raman Spectroscopy 44 6 857 865 0377-0486 31 12 2013 2013-12-31 10.1002/jrs.4283 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2013-06-18T11:42:26.5958369 2013-03-27T12:31:44.7524672 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics T. M James 1 M Schlösser 2 S Fischer 3 M Sturm 4 B Bornschein 5 R. J Lewis 6 H. H Telle 7 Helmut Telle 8 Timothy James 9
title Accurate depolarization ratio measurements for all diatomic hydrogen isotopologues
spellingShingle Accurate depolarization ratio measurements for all diatomic hydrogen isotopologues
Helmut Telle
Timothy James
title_short Accurate depolarization ratio measurements for all diatomic hydrogen isotopologues
title_full Accurate depolarization ratio measurements for all diatomic hydrogen isotopologues
title_fullStr Accurate depolarization ratio measurements for all diatomic hydrogen isotopologues
title_full_unstemmed Accurate depolarization ratio measurements for all diatomic hydrogen isotopologues
title_sort Accurate depolarization ratio measurements for all diatomic hydrogen isotopologues
author_id_str_mv 7f645d598f0afb573309bc5f86ea46fa
8a92e003a0ce92f67bba506d7f03344f
author_id_fullname_str_mv 7f645d598f0afb573309bc5f86ea46fa_***_Helmut Telle
8a92e003a0ce92f67bba506d7f03344f_***_Timothy James
author Helmut Telle
Timothy James
author2 T. M James
M Schlösser
S Fischer
M Sturm
B Bornschein
R. J Lewis
H. H Telle
Helmut Telle
Timothy James
format Journal article
container_title Journal of Raman Spectroscopy
container_volume 44
container_issue 6
container_start_page 857
publishDate 2013
institution Swansea University
issn 0377-0486
doi_str_mv 10.1002/jrs.4283
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 0
active_str 0
description The Raman depolarization ratios for individual Q1(J”) branch lines of all diatomic hydrogen isotopologues – H2, HD, D2, HT, DT, and T2 – were measured, for all rotational levels with population larger than 1/100 relative to the Boltzmann maximum at room temperature. For these measurements, the experimental setup normally used for the monitoring of the tritiated hydrogen molecules at the KArlsruhe TRItium Neutrino experiment was adapted to optimally control the excitation laser power and polarization, and to precisely define the Raman light collection geometry. The measured Raman depolarization values were compared to theoretical values, which are linked to polarizability tensor quantities. For this, the ‘raw data’ were corrected taking into account distinct aspects affecting Raman depolarization data, including (1) excitation polarization impurities; (2) extended Raman excitation volumes; and (3) Raman light collection over finite solid angles. Our corrected depolarization ratios of the hydrogen isotopologues agree with the theoretical values (based on ab initio quantum calculations by R.J. LeRoy, University of Waterloo, Canada) to better than 5% for nearly all of the measured Q1(J”) lines, with 1-sigma confidence level. The results demonstrate that reliable, accurate Raman depolarization ratios can be extracted from experimental measurements, which may be substantially distorted by excitation polarization impurities and by geometrical effects.
published_date 2013-12-31T03:16:35Z
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score 11.013371

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