VIBRATIONAL OVERTONE SPECTRA OF $C_2H_6$ AND $C_2H_4$ IN CRYOGENIC LIQUIDS
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Date
2009
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Publisher
Ohio State University
Abstract
Vibrational overtone spectra of $C_2H_6$ and $C_2H_4$ in cryogenic solutions were recorded between 5000 and 14000 cm$^{-1}$. Spectral regions for the first four overtones were measured using a Fourier transform spectrophotometer. The fifth overtone $(\Delta\nu=6)$ spectra between 15,000 and 16,000 cm$^{-1}$ were recorded with a double beam (pump-probe) thermal lens technique using concentrations as low as 10$^{-3}$ mole fraction. The peak frequency shift $(\Delta\omega)$ from gas phase to solution is explained by the change in harmonic frequency and anharmonicity in solution with respect to the gas phase values. The bandwidth $(\Delta\omega_{1/2})$ of the $(\Delta\nu= 6)$ C-H absorption bands in solution can be explained in terms of collisions with the solvent molecules.
Description
Author Institution: Department of Chemistry and Biochemistry, Baylor University, Waco, Texas, 76798