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Evaluation method for Raman depolarization measurements including geometrical effects and polarization aberrations

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

Journal of Raman Spectroscopy, Volume: 44, Issue: 3

Swansea University Authors: Helmut Telle, Timothy James

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DOI (Published version): 10.1002/jrs.4201

Abstract

In this article, we address the notoriously difficult problem to quantitatively link measured Raman depolarization values to theoretical polarizability tensor quantities, since quantum calculations do not incorporate experimental parameters. For this, we introduce a numerical model to calculate, for...

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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/cronfa14492
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first_indexed 2013-07-23T12:12:19Z
last_indexed 2019-06-13T19:20:38Z
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spelling 2019-06-13T18:02:48.8416739 v2 14492 2013-03-27 Evaluation method for Raman depolarization measurements including geometrical effects and polarization aberrations 7f645d598f0afb573309bc5f86ea46fa Helmut Telle Helmut Telle true false 8a92e003a0ce92f67bba506d7f03344f Timothy James Timothy James true false 2013-03-27 FGSEN In this article, we address the notoriously difficult problem to quantitatively link measured Raman depolarization values to theoretical polarizability tensor quantities, since quantum calculations do not incorporate experimental parameters. For this, we introduce a numerical model to calculate, for realistic experimental configurations, effective Raman line strength functions, Phi, which find their way into depolarization ratios, rho. The model is based on interlinked integrations over the angles in the light collection path and a finite Raman source volume along the excitation laser beam. The model deals also with the conditional aperture parameters, associated with more than one optical component in the light collection path. Finally, we also can take into account polarization aberrations introduced by the sample cell windows. The procedure was fully tested for Raman depolarization spectra of selected hydrogen isotopologues. Distinct aspects affecting Raman depolarization data were validated, namely: (1) excitation polarization impurities; (2) extended Raman excitation volumes; (3) Raman light collection over finite solid angles; and (4) polarization aberrations introduced by optics in the light collection path. The correction of the experimental measurement data for the aforementioned effects resulted in depolarization ratios for the Q<sub>1</sub>(J ") Raman lines of H<sub>2</sub> and T<sub>2</sub>, which mostly differed by less than 5% from those obtained by quantum-calculations. Journal Article Journal of Raman Spectroscopy 44 3 462 0377-0486 24 1 2013 2013-01-24 10.1002/jrs.4201 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2019-06-13T18:02:48.8416739 2013-03-27T12:28:20.2143398 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics M Schlösser 1 T. M James 2 S Fischer 3 R. J Lewis 4 B Bornschein 5 H. H Telle 6 Helmut Telle 7 Timothy James 8
title Evaluation method for Raman depolarization measurements including geometrical effects and polarization aberrations
spellingShingle Evaluation method for Raman depolarization measurements including geometrical effects and polarization aberrations
Helmut Telle
Timothy James
title_short Evaluation method for Raman depolarization measurements including geometrical effects and polarization aberrations
title_full Evaluation method for Raman depolarization measurements including geometrical effects and polarization aberrations
title_fullStr Evaluation method for Raman depolarization measurements including geometrical effects and polarization aberrations
title_full_unstemmed Evaluation method for Raman depolarization measurements including geometrical effects and polarization aberrations
title_sort Evaluation method for Raman depolarization measurements including geometrical effects and polarization aberrations
author_id_str_mv 7f645d598f0afb573309bc5f86ea46fa
8a92e003a0ce92f67bba506d7f03344f
author_id_fullname_str_mv 7f645d598f0afb573309bc5f86ea46fa_***_Helmut Telle
8a92e003a0ce92f67bba506d7f03344f_***_Timothy James
author Helmut Telle
Timothy James
author2 M Schlösser
T. M James
S Fischer
R. J Lewis
B Bornschein
H. H Telle
Helmut Telle
Timothy James
format Journal article
container_title Journal of Raman Spectroscopy
container_volume 44
container_issue 3
publishDate 2013
institution Swansea University
issn 0377-0486
doi_str_mv 10.1002/jrs.4201
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 In this article, we address the notoriously difficult problem to quantitatively link measured Raman depolarization values to theoretical polarizability tensor quantities, since quantum calculations do not incorporate experimental parameters. For this, we introduce a numerical model to calculate, for realistic experimental configurations, effective Raman line strength functions, Phi, which find their way into depolarization ratios, rho. The model is based on interlinked integrations over the angles in the light collection path and a finite Raman source volume along the excitation laser beam. The model deals also with the conditional aperture parameters, associated with more than one optical component in the light collection path. Finally, we also can take into account polarization aberrations introduced by the sample cell windows. The procedure was fully tested for Raman depolarization spectra of selected hydrogen isotopologues. Distinct aspects affecting Raman depolarization data were validated, namely: (1) excitation polarization impurities; (2) extended Raman excitation volumes; (3) Raman light collection over finite solid angles; and (4) polarization aberrations introduced by optics in the light collection path. The correction of the experimental measurement data for the aforementioned effects resulted in depolarization ratios for the Q<sub>1</sub>(J ") Raman lines of H<sub>2</sub> and T<sub>2</sub>, which mostly differed by less than 5% from those obtained by quantum-calculations.
published_date 2013-01-24T03:16:35Z
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score 11.013619

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