THE RAMAN SPECTRUM OF METHANE-d4

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Abstract
The Raman spectrum of CD4 at 1 atm pressure was photographed with a spectral resolution of ~0.4 cm−1, and rotational analyses of the ν2 and ν3 bands were carried out. The B0 values obtained from the ν2 and ν3 bands are 2.6330 ± 0.0007 and 2.6328 ± 0.0007 cm−1, respectively; the value of r0 determined from the former is 1.09181 ± 0.00029 Å. The rotational levels of the ν = 1 state of ν2 are split with effective B1 values equal to 2.6894, 2.7351, and 2.7434 cm−1. Thirteen of the fifteen branches of the ν3 band were observed; these also show multiple B1 values. The value obtained for ζ3 is 0.1648. Structure was observed but not analyzed in the ν1, 2ν4, and ν2 + ν4 bands. On the basis of the Raman data the structures of the ν2 and ν3 infrared bands are discussed.

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