Abstract
Photothermal beam deflection (PBD) is a highly sensitive technique for monitoring the time-dependent heat release resulting from fast (μs time scale) photophysical and photochemical processes. A PBD apparatus which has been developed for use in the time-resolved kinetic study of fast photophysical and photochemical processes is described here. This instrument uses a pulsed excimer laser as the excitation source and a cw He–Ne laser as the probe beam in a counterpropagating geometry. The probe beam deflection is detected with a segmented fast photodiode (bi-cell) and a wideband differential amplifier. This PBD system has been used to study second-order (nongeminate back electron transfer) and complex-exponential (decay of molecular triplet states in the presence of oxygen) processes in solution. The kinetic information obtained with this PBD system has been shown to compare favorably with the same kinetic information obtained by time-resolved transient absorption spectroscopy.
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