The integrated intensities of chemically‐exchanging vibrational bands as given by the Bloch equations

Abstract Recent predictions of dramatic integrated intensity changes in vibrational bands undergoing collapse due to chemical exchange are the result of improper normalization factors inserted into the Bloch‐equation treatment. For the correct form of the Bloch equations, integrated intensity is approximately conserved. However, even in this case the problems inherent in applying the Bloch equations to vibrational systems remain.