Line-Mixing Effects in Q Branches of CO2: I. Influence of Parity in Δ ↔ Π Bands: I. Influence of Parity in Δ ↔ Π Bands

R. Rodrigues, Ghislain Blanquet, J. Walrand, B. Khalil, R. Le Doucen, F. Thibault, J.-M. Hartmann

Research output: Contribution to journalArticle

Abstract

A theoretical model based on the energy corrected sudden (ECS) approximation is used in order to account for line- mixing effects in Δ ↔ Π infrared Q branches of CO. Its quality is demonstrated by comparisons with numerous laboratory spectra of CO-He and CO-N mixtures: three Q branches in the 4 and 17 μm regions are investigated at room temperature in a wide pressure range. The influence of mixing between Q(J) lines associated with odd and even values of the rotational quantum number J is demonstrated and analyzed in detail. It is shown that, in contrast to available fitting law approaches, the ECS model correctly predicts the influence of the parity of the rotational quantum numbers J and J′ on coupling between the Q(J) and Q(J′) lines. Comparisons between the effects of collisions of CO with N and He are made and analyzed. They show that these two systems involve different line couplings within the Q branch.
Original languageEnglish
Pages (from-to)256-268
Number of pages13
JournalJournal of molecular spectroscopy
Volume186
Issue number2
Publication statusPublished - 1 Dec 1997

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Carbon Monoxide
quantum numbers
parity
collisions
energy
room temperature
approximation
Infrared radiation
Temperature

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title = "Line-Mixing Effects in Q Branches of CO2: I. Influence of Parity in Δ ↔ Π Bands: I. Influence of Parity in Δ ↔ Π Bands",
abstract = "A theoretical model based on the energy corrected sudden (ECS) approximation is used in order to account for line- mixing effects in Δ ↔ Π infrared Q branches of CO. Its quality is demonstrated by comparisons with numerous laboratory spectra of CO-He and CO-N mixtures: three Q branches in the 4 and 17 μm regions are investigated at room temperature in a wide pressure range. The influence of mixing between Q(J) lines associated with odd and even values of the rotational quantum number J is demonstrated and analyzed in detail. It is shown that, in contrast to available fitting law approaches, the ECS model correctly predicts the influence of the parity of the rotational quantum numbers J and J′ on coupling between the Q(J) and Q(J′) lines. Comparisons between the effects of collisions of CO with N and He are made and analyzed. They show that these two systems involve different line couplings within the Q branch.",
author = "R. Rodrigues and Ghislain Blanquet and J. Walrand and B. Khalil and {Le Doucen}, R. and F. Thibault and J.-M. Hartmann",
note = "Copyright 2005 Elsevier B.V., All rights reserved.",
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language = "English",
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pages = "256--268",
journal = "Journal of molecular spectroscopy",
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Line-Mixing Effects in Q Branches of CO2: I. Influence of Parity in Δ ↔ Π Bands : I. Influence of Parity in Δ ↔ Π Bands. / Rodrigues, R.; Blanquet, Ghislain; Walrand, J.; Khalil, B.; Le Doucen, R.; Thibault, F.; Hartmann, J.-M.

In: Journal of molecular spectroscopy, Vol. 186, No. 2, 01.12.1997, p. 256-268.

Research output: Contribution to journalArticle

TY - JOUR

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T2 - I. Influence of Parity in Δ ↔ Π Bands

AU - Rodrigues, R.

AU - Blanquet, Ghislain

AU - Walrand, J.

AU - Khalil, B.

AU - Le Doucen, R.

AU - Thibault, F.

AU - Hartmann, J.-M.

N1 - Copyright 2005 Elsevier B.V., All rights reserved.

PY - 1997/12/1

Y1 - 1997/12/1

N2 - A theoretical model based on the energy corrected sudden (ECS) approximation is used in order to account for line- mixing effects in Δ ↔ Π infrared Q branches of CO. Its quality is demonstrated by comparisons with numerous laboratory spectra of CO-He and CO-N mixtures: three Q branches in the 4 and 17 μm regions are investigated at room temperature in a wide pressure range. The influence of mixing between Q(J) lines associated with odd and even values of the rotational quantum number J is demonstrated and analyzed in detail. It is shown that, in contrast to available fitting law approaches, the ECS model correctly predicts the influence of the parity of the rotational quantum numbers J and J′ on coupling between the Q(J) and Q(J′) lines. Comparisons between the effects of collisions of CO with N and He are made and analyzed. They show that these two systems involve different line couplings within the Q branch.

AB - A theoretical model based on the energy corrected sudden (ECS) approximation is used in order to account for line- mixing effects in Δ ↔ Π infrared Q branches of CO. Its quality is demonstrated by comparisons with numerous laboratory spectra of CO-He and CO-N mixtures: three Q branches in the 4 and 17 μm regions are investigated at room temperature in a wide pressure range. The influence of mixing between Q(J) lines associated with odd and even values of the rotational quantum number J is demonstrated and analyzed in detail. It is shown that, in contrast to available fitting law approaches, the ECS model correctly predicts the influence of the parity of the rotational quantum numbers J and J′ on coupling between the Q(J) and Q(J′) lines. Comparisons between the effects of collisions of CO with N and He are made and analyzed. They show that these two systems involve different line couplings within the Q branch.

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