Collision broadening of CO2transitions in the region of 4.3 µm. Effects of broadening gas (He, Ar and N2), rovibrational states and temperature
- 1 January 1995
- journal article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 91 (2) , 191-195
- https://doi.org/10.1039/ft9959100191
Abstract
The collision-broadening parameters, b0 L, for a number of lines in the Δν3= 1 transitions from the (0000), (0110), (0200) and (0220) vibrational states of 12C16O2 and the (0000) state of 18O12C16O have been measured at room temperature (300K) and with N2, Ar and He as the broadening gases, using a tunable IR diode laser. The values of b0 L decrease with increase in the rotational quantum numbers associated with the transition but there is no significant difference in the broadening of lines from different vibrational bands. Measurements of b0 L were also carried out at 160 K on lines in the (0001,0000) band. With the changes in b0 L(units of cm–1 atm–1) expressed in the form b0 L(T)=b0 L(T= 298 K)(298/T)n, n= 0.69 ± 0.17 for He, 0.88 ± 0.18 for Ar, and 0.85 ± 0.09 for N2.Keywords
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