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

This article describes examples of the application of time-resolved in frared spectroscopy (TRIR) to the probing of the excited states of tra nsition metal species. Other ''direct'' methods for excited states inc lude time-resolved absorption spectroscopy, and, more importantly, tim e-resolved resonance Raman spectroscopy (TR3). Both of these technique s have limitations and hence TRIR is of value in complementing them. T he common 'indirect'' methods are absorption, emission, and excitation spectroscopies, to which has been more recently added, resonance Rama n, particularly in the time-dependent formulation. The relevance of th ese methods is also discussed.