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This is a Quantitative Study study.

Line shape parameters of the first pure rotational R lines of CO in H2 baths down to a few kelvins

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Calculations on collisional widths and shifts of carbon monoxide lines in hydrogen baths, revealing discrepancies below 30 K.

Theoretical calculations on line shape parameters show good agreement with literature for 30–500 K, but highlight discrepancies at lower temperatures.
Substantial disagreement between experimental and theoretical values for the R(0) and R(1) lines is confirmed below 30 K.
The study reveals complexity in velocity-changing collisions affecting optical frequency and line shapes at low temperatures.
Beyond-Voigt effects, including collision duration, are significant in explaining the discrepancies observed in low-temperature experiments.

Thibault et al. (2025) studied this question.

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