G-sum rule separation of overlapping vibrational bands

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Abstract
The G intensity sum rule is used to determine a separation ratio of 1.52:10 for the ν2, ν5 overlapped band of CHF3 and to resolve the sign ambiguities in the ∂p/∂Qi values of both CHF3 and CDF3. The method can be applied to molecules for which one isotopic species contains overlapping bands corresponding to normal modes of different symmetry whereas another species is free from such separation problems. This technique should prove useful as a check on computer simulation band separations and in cases where experimental separation is not possible.