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

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 journal › Article › peer-review

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 language	English
Pages (from-to)	256-268
Number of pages	13
Journal	Journal of molecular spectroscopy
Volume	186
Issue number	2
Publication status	Published - 1 Dec 1997

Cite this

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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.",

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AU - Rodrigues, R.

AU - Blanquet, Ghislain

AU - Walrand, J.

AU - Khalil, B.

AU - Le Doucen, R.

AU - Thibault, F.

AU - Hartmann, J.-M.

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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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

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