RING-DOWN CAVITY ABSORPTION SPECTROSCOPY OF HCN. LINE MIXING IN THE 106 OVERTONE R BRANCH.
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Date
1993
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Ohio State University
Abstract
The Ring-Down Cavity (RDC) absorption-detection scheme is a relatively recent technique which allows for high-sensitivity $(2.E-9 cm^{-1})$, calibrated, intensity measurement for gas phase samples. This is a study of the self-pressure-broadened contour of the R branch in the 106 HCN overtone RDC spectrum. As it has been shown by Pine and $Looney^{1}$ for the HCN Q brances of infrared vibrational bands, the pressure broadening behaviour appears to be independent of the vibrational excitation. Therefore the 106 band can be considered as a representative sample for all of the HCN overtones. Due to the strong line overlap occurring in the proximity of the overtone band head, line mixing is expected to give an observable contribution to the pressure-broadened profile, already starting from a pressure of the order of 100 torr. Interesting is the comparison with the same line-mixing models (MEG, the Modified Exponential energy-Gap fitting law and ECS, the Energy-Corrected Sudden inelastic rate scaling law) successfully employed by Pine and Looney for modeling infrared HCN Q-branches.
Description
1. A. S. Pine and J. P. Looney J. Chem. Phys. 96, 1704 (1992)
Author Institution: Department of Chemistry, Princeton University
Author Institution: Department of Chemistry, Princeton University