CAVITY RING DOWN AT LOW TEMPERATURES: VIBRATIONAL OVERTONE ABSORPTION OF DEUTERATED METHANES AT 110 K
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Publisher:Ohio State University
The C-H stretch overtone absorptions of ($\Delta \upsilon = 5$) of CH$_4$, CH$_3$D, CH$_2$D$_2$, and CHD$_3$ have been obtained using the phase shift cavity ring down technique. A low temperature cell was designed and adapted to the CRD experiment to measure absorption bands at any temperature between 10 K and 298 K. The spectra were obtained at room temperature and at 110 K. The partially resolved rotational spectrum of CHD$_3$ that included the transitions 5$\nu_1$ and 4$\nu_1+2\nu_5$ was obtained and compared with the calculated spectrum. The unresolved vibrational bands around the $\Delta \upsilon = 5$ region of CH$_2$D$_2$, CH$_3$D, and CH$_4$ were also obtained at several temperatures between 100K and 298 K. The integrated absorption was calculated as a function of the density of the gas samples and used to obtain the cross section and the oscillator strength of the transition for each molecule.
Author Institution: Department of Chemistry and Biochemistry, Baylor University, Waco, Texas, 76798
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