F and G sum rules as error indicators of experimental vibrational intensity data: The CHxD3−xBr molecules

Using the CHxD3−xBr molecules as examples the F and G sum rules are shown to be useful indicators of errors in gas-phase fundamental vibrational intensity data. The recently measured intensities for CH3Br, CH2DBr, and CHD2Br are shown to be nicely consistent with the sum rule restrictions although the CD3Br data apparently contain considerable experimental error. Diagnostic capabilities of these sum rules for localizing the sources of the experimental error are discussed.