What question did this study set out to answer?

To establish and evaluate an empirical fitting procedure that accounts for rotational line-width variations in the infrared absorption bands of diatomic gases.

January 1, 1971Molecular Physics

Collisional broadening of infra-red absorption lines

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Authors

DWD. R. WilliamsUniversity of North Carolina at Chapel Hill DWDavid Carter WenstrandKansas State University RBRobert J. BrockmanKansas State University

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Implication

Theoretical modeling reveals collision-broadened line width variations in diatomic gases, indicating that diabatic rotational transitions dictate infrared absorption behavior.

Key Points

To establish and evaluate an empirical fitting procedure that accounts for rotational line-width variations in the infrared absorption bands of diatomic gases.
Modeled line broadening by separating interactions into line-dependent diabatic hard collisions that induce transitions to higher rotational states and a baseline cross section for all other collisions.
Constrained transition probabilities using molecular energy, angular momentum availability, and an empirically tuned maximum collision parameter derived from independent molecular properties.
Fitted experimental Lorentz half-widths for the 0 → 1 and 0 → 2 vibrational bands of pure and foreign-gas-mixed carbon monoxide and hydrogen chloride, incorporating resonant-dipole cross sections for hydrogen chloride self-broadening.
The fitting procedure successfully captured the line-number dependence of Lorentz half-widths across both P and R branches in self-broadened carbon monoxide and foreign-gas-broadened carbon monoxide and hydrogen chloride.
Accurate modeling of hydrogen chloride self-broadening required the explicit addition of a resonant-dipole collision cross section.
The theoretical framework demonstrated sufficient flexibility for extension to other molecular infrared absorbers, including hydrogen bromide, hydrogen fluoride, and carbon dioxide.

Cite This Study

Williams et al. (1971) studied this question.

synapsesocial.com/papers/6a865bbf16da06070a73a128 https://doi.org/10.1080/00268977100100761

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Implication

Theoretical modeling reveals collision-broadened line width variations in diatomic gases, indicating that diabatic rotational transitions dictate infrared absorption behavior.

Collisional broadening of infra-red absorption lines

Discussion

Member takes

Implication

Key Points

Cite This Study

Collisional broadening of infra-red absorption lines

Discussion

Member takes

Implication

Key Points

Cite This Study

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