Abstract
The goal of this note is to comment on the unusual temperature variations of the integrated absorption intensity measured recently in the region of the oxygen fundamental. More accurate than previous ones and covering wider temperature interval, the observations by Baranov and Lafferty showed that the integrated intensity reaches its minimum at roughly 280 K and then increases steadily at elevated temperature. We suggest that this behaviour can be understood in terms of the flatness of intermolecular potential accompanied by the dominance of the absorption inducing collisions at extremely short distances corresponding to repulsive interaction.
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