LASER-INDUCED-FLUORESCENCE DETECTION OF OVERTONE TRANSITIONS OF TWO HF CONTAINING COMPLEXES
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Date
1994
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Publisher
Ohio State University
Abstract
The high-resolution laser-induced fluorescence spectra of the v = 3 excitation of the HF stretch in HFHC1 and $N_{2}HF$ molecules are measured. The complexes are formed in a super-sonic jet with HFHC1 in an argon expansion and $N_{2}HF$ in a nitrogen expansion. For HFHCl, a single band with $K = 0,\Delta K=0$ of both isotopic species, was observed; and for $N_{2}HF$, both the $\Sigma - \Sigma$ second overtone of pure HF stretch and the $\Pi - \Pi$ hot band of the $N_{2}$ bend were recorded. The HF submolecule was pumped from v = 0 to v = 3 by radiation from the TiSapphire ring laser operating in the 800 - 900 nm range. Both $\Delta v = 1$ and $\Delta v = 2$ emission of the HF fragment were observed by large area PbS and Ge detectors, respectively. The average linewidth of 300 MHz in this overtone region is approximately 30 times greater than at the fundamental. The linewidths of the vibration-rotation transitions of HFHCl show considerable variations with both Cl isotope and J level. Although the isotopic dependence of the linewidths was observed in the fundamental, no perceptible J-dependence was detected. The observed rotational temperature of $N_{2}HF, 17K,$ is higher than the typical rotational temperatures observed for complexes produced in argon expansion of 11 K.
Description
Author Institution: Department of Chemistry, Harvard University; Department of Chemistry, Institute of Atomic and Molecular Science