Theoretical and experimental study of infrared spectra of He 2-CO2

Jian Tang, A. R W McKellar, Xiao Gang Wang, Tucker Carrington

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Additional high-resolution lines in the ν3 CO2 fundamental band of the rovibrational spectrum of He2-CO2 have been observed using a tunable infrared laser to probe a pulsed supersonic jet expansion. The ro-vibrational spectrum was calculated using Euler angles and five vibrational coordinates that specify the positions of the He atoms with respect to the CO2 molecule, a product basis, and a Lanczos eigensolver. Rotational states with J = 0, 1, 2, and 3 associated with the vibrational ground state and different states (νt) of the torsional motion of the two He atoms about the CO2 axis are identified and assigned. The assignment is consistent with having different principle axis orientiations in νt = 0 and νt = 1 states. Δνt = 1 infrared transistions are forbidden due to the symmetry of CO2, but Δνt = 1 microwave transistions are possible. Theoretical line positions and intensities are predicted. Good agreement between experiment and theory was obtained. The calculated energy levels and intensities were crucial in assigning some of the weaker observed transitions.

Original languageEnglish
Pages (from-to)417-423
Number of pages7
JournalCanadian Journal of Physics
Volume87
Issue number5
DOIs
Publication statusPublished - May 2009

Fingerprint

infrared spectra
rotational states
tunable lasers
infrared lasers
vibrational spectra
atoms
energy levels
microwaves
expansion
ground state
probes
high resolution
symmetry
products
molecules

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Theoretical and experimental study of infrared spectra of He 2-CO2 . / Tang, Jian; McKellar, A. R W; Wang, Xiao Gang; Carrington, Tucker.

In: Canadian Journal of Physics, Vol. 87, No. 5, 05.2009, p. 417-423.

Research output: Contribution to journalArticle

Tang, Jian ; McKellar, A. R W ; Wang, Xiao Gang ; Carrington, Tucker. / Theoretical and experimental study of infrared spectra of He 2-CO2 In: Canadian Journal of Physics. 2009 ; Vol. 87, No. 5. pp. 417-423.
@article{d8c7e425c09e455f9411643924e9ce5b,
title = "Theoretical and experimental study of infrared spectra of He 2-CO2",
abstract = "Additional high-resolution lines in the ν3 CO2 fundamental band of the rovibrational spectrum of He2-CO2 have been observed using a tunable infrared laser to probe a pulsed supersonic jet expansion. The ro-vibrational spectrum was calculated using Euler angles and five vibrational coordinates that specify the positions of the He atoms with respect to the CO2 molecule, a product basis, and a Lanczos eigensolver. Rotational states with J = 0, 1, 2, and 3 associated with the vibrational ground state and different states (νt) of the torsional motion of the two He atoms about the CO2 axis are identified and assigned. The assignment is consistent with having different principle axis orientiations in νt = 0 and νt = 1 states. Δνt = 1 infrared transistions are forbidden due to the symmetry of CO2, but Δνt = 1 microwave transistions are possible. Theoretical line positions and intensities are predicted. Good agreement between experiment and theory was obtained. The calculated energy levels and intensities were crucial in assigning some of the weaker observed transitions.",
author = "Jian Tang and McKellar, {A. R W} and Wang, {Xiao Gang} and Tucker Carrington",
year = "2009",
month = "5",
doi = "10.1139/P08-119",
language = "English",
volume = "87",
pages = "417--423",
journal = "Canadian Journal of Physics",
issn = "0008-4204",
publisher = "National Research Council of Canada",
number = "5",

}

TY - JOUR

T1 - Theoretical and experimental study of infrared spectra of He 2-CO2

AU - Tang, Jian

AU - McKellar, A. R W

AU - Wang, Xiao Gang

AU - Carrington, Tucker

PY - 2009/5

Y1 - 2009/5

N2 - Additional high-resolution lines in the ν3 CO2 fundamental band of the rovibrational spectrum of He2-CO2 have been observed using a tunable infrared laser to probe a pulsed supersonic jet expansion. The ro-vibrational spectrum was calculated using Euler angles and five vibrational coordinates that specify the positions of the He atoms with respect to the CO2 molecule, a product basis, and a Lanczos eigensolver. Rotational states with J = 0, 1, 2, and 3 associated with the vibrational ground state and different states (νt) of the torsional motion of the two He atoms about the CO2 axis are identified and assigned. The assignment is consistent with having different principle axis orientiations in νt = 0 and νt = 1 states. Δνt = 1 infrared transistions are forbidden due to the symmetry of CO2, but Δνt = 1 microwave transistions are possible. Theoretical line positions and intensities are predicted. Good agreement between experiment and theory was obtained. The calculated energy levels and intensities were crucial in assigning some of the weaker observed transitions.

AB - Additional high-resolution lines in the ν3 CO2 fundamental band of the rovibrational spectrum of He2-CO2 have been observed using a tunable infrared laser to probe a pulsed supersonic jet expansion. The ro-vibrational spectrum was calculated using Euler angles and five vibrational coordinates that specify the positions of the He atoms with respect to the CO2 molecule, a product basis, and a Lanczos eigensolver. Rotational states with J = 0, 1, 2, and 3 associated with the vibrational ground state and different states (νt) of the torsional motion of the two He atoms about the CO2 axis are identified and assigned. The assignment is consistent with having different principle axis orientiations in νt = 0 and νt = 1 states. Δνt = 1 infrared transistions are forbidden due to the symmetry of CO2, but Δνt = 1 microwave transistions are possible. Theoretical line positions and intensities are predicted. Good agreement between experiment and theory was obtained. The calculated energy levels and intensities were crucial in assigning some of the weaker observed transitions.

UR - http://www.scopus.com/inward/record.url?scp=68649099016&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=68649099016&partnerID=8YFLogxK

U2 - 10.1139/P08-119

DO - 10.1139/P08-119

M3 - Article

VL - 87

SP - 417

EP - 423

JO - Canadian Journal of Physics

JF - Canadian Journal of Physics

SN - 0008-4204

IS - 5

ER -