COMBINED APPLICATION OF PICOSECOND TRANSIENT ABSORPTION AND EMISSION MEASUREMENTS IN STUDIES OF RADICAL-ION PAIR DYNAMICS

Much of the emphasis in the development of methods for time-resolved m easurements is on increasing experimental time resolution, Equally imp ortant, however, is the establishment of methods to apply existing tec hniques to problems of increasing complexity, Here we describe the app lication of a combination of picosecond absorption and emission measur ements to solve a complex kinetic problem in organic photophysics, nam ely, the dynamics of interconverting radical-ion pairs, Although fairl y routine, the emission measurements require higher time resolution an d the absorption measurements require higher signal-to-noise ratios th an are often achieved, In the first part of this paper we describe the ways in which these experimental requirements have been met. Next, th e radical-ion pair kinetic problem and its solution are described. Fin ally, we discuss some future directions for the techniques as they rel ate to studies of radical-ion pair dynamics.