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Abstract
The rather weak ν2 Raman band of CD4 has been recorded with a resolution of about 0·45 cm-1. The data have been analysed in two ways: (i) treating ν2 as an isolated band, and (ii) analysing the ν2 and ν4 bands together by a simultaneous diagonalization of the v 2=1 and v 4=1 states coupled by the Bζ2,4 Coriolis interaction term. Although the former treatment is satisfactory for low J values, the explicit inclusion of the Coriolis coupling is necessary to reproduce the observed spectrum for all J values.