TIME-RESOLVED INFRARED-SPECTROSCOPY OF EXCITED-STATES OF TRANSITION-METAL SPECIES

This article describes examples of the application of time-resolved infrared spectroscopy (TRIR) to the probing of the excited states of transition metal species. Other ''direct'' methods for excited states include time-resolved absorption spectroscopy, and, more importantly, time-resolved resonance Raman spectroscopy (TR3). Both of these techniques have limitations and hence TRIR is of value in complementing them. The common 'indirect'' methods are absorption, emission, and excitation spectroscopies, to which has been more recently added, resonance Raman, particularly in the time-dependent formulation. The relevance of these methods is also discussed.