Measurement and Analysis of the Raman Intensities of 12CD4

Abstract

The stimulated Raman spectrum of 12CD4 was recorded at high resolution, in the spectral range 1963 to 2260 cm−1. Intensities of the rovibrational transitions were estimated by fitting the line profiles. The recorded elementary spectrum was 1 cm−1 wide; all recordings were then intensity calibrated. Afterward, the relative Raman intensities were analyzed by using a polarizability model developed previously [A. Boutahar and M. Loëte, Can. J. Phys.69, 26-35 (1991); J. P. Champion, M. Loëte, and G. Pierre, in "Spectroscopy of the Earth′s Atmosphere and Interstellar Molecules" (K. Narahari Rao and A. Weber, Eds.), pp. 388-397, Academic Press, Boston, 1992]. The investigated region has five interacting bands (ν1, ν3, 2ν2, ν2 + ν4, and 2ν4) and they were analyzed simultaneously. Experimental data enabled retrieval of six polarizability parameters. The agreement between calculated and measured intensities is within about 12%. To confirm the results, some calculations were made of other spectra, recorded using spontaneous or stimulated Raman techniques.