Flow-tube studies of vibrational energy transfer in HF(v)+HF, DF(v)+HF, and DF(v)+D$sub 2$ systems

Journal Article · Mon Sep 15 04:00:00 EDT 1975 · J. Chem. Phys., v. 63, no. 6, pp. 2453-2460

OSTI ID:4156063

Kwok, M A; Wilkins, R L

A medium-pressure (1 Torr), large-diameter (10 cm) flow tube has been used to measure rate coefficients at 298 degreeK for (a) total relaxation (sum of vibrational--vibrational and vibrational--rotational, translational processes) of HF(v=1, 2, 3, 4, and 5) by HF, (b) relaxation of DF(1, 2, 3, and 4) by HF, and (c) over-all relaxation of DF(v=1, 2, 3, and 4) by D$sub 2$. The chemically produced vibrationally excited HF or DF species have been studied by monitoring their vibrational--rotational emission in a fast-flow system. The rate coefficient for the relaxation of HF(1) by HF is 5.3times10$sup 4$ sec$sup - 1$center-dotTorr$sup -1$. The measured rate coefficients for the deexcitation of HF(v=2, 3, 4, and 5) by HF are 5.3times10$sup 5$, 8.5times10$sup 5$, 8.8times10$sup 5$, and 2.8times10$sup 5$ sec$sup -1$center-dotTorr$sup -1$, respectively. The rate coefficients for the vibrational--rotational, translational deexcitation from the upper vibrational levels of DF(v) by HF are found to have a nonlinear vibrational dependence. The rate coefficient for the relaxation of DF(v=1) by D$sub 2$ is 1.35times10$sup 4$ sec$sup -1$center- dotTorr$sup -1$.

• Research Organization: The Aerospace Corporation, El Segundo, California 90245
• NSA Number: NSA-33-002622
• OSTI ID: 4156063
• Journal Information: J. Chem. Phys., v. 63, no. 6, pp. 2453-2460, Journal Name: J. Chem. Phys., v. 63, no. 6, pp. 2453-2460; ISSN JCPSA
• Country of Publication: United States
• Language: English

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