Diagnosing vibrational states of multiatomic molecules using the integral intensity of overtone and component frequency fluorescence

A theoretical investigation is performed of the possibility of using nonlinear infrared-fluorescence for diagnosing the vibrational states of multiatomic molecules. A method is justified for measuring the absolute vibrational temperatures and for determining the degree of imbalance of the intramodal and intermodal energy distributions through the relation of the integral intensities of fluorescence of overtones and component frequencies.