COLLISION-INDUCED ABSORPTION IN PURE $O_{2}, CO_{2}$, AND $N_{2}$
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Date
2004
Authors
Baranov, Y. I.
Lafferty, W. J.
Fraser, G. T.
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Collision-induced absorption (CIA) of the fundamental band of pure oxygen has been obtained over the temperature range $-80^{\circ}$ to $+85^{\circ} C$. The integrated band intensity is at a minimum at $0^{\circ} C$ and increases on either side of this temperature. Band intensities of the CIA in the fundamental band of $N_{2}$ as well as the $CO_{2}$ Fermi dyad are currently under investigation. Preliminary results indicate that the temperature dependence of the band intensity of the nitrogen CIA parallels that of $O_{2}$. In contrast, the integrated intensities of the $10^{0}0/02^{0}0$ Fermi dyad in $CO_{2}$ increase steadily as the temperature is decreased. The integrated intensities double as the temperature goes from $+72^{\circ}$ to $-80^{\circ} C$. This indicates that at low temperatures the bound dimer is the major species in the gas. The band structure obtained at elevated temperatures will be presented.
Description
Author Institution: Optical Technology Division, NIST