The development of methods of generation of very short pulses of light with widths about or below 100 fs has enabled the measurement of the rate of direct photodissociation of a bond. The experiment measures absorption as a function of both time and the degree to which the probing light is off resonance with one of the fragments. A classical model with an exponential repulsion is used to relate experimental observables to the dissociation time and properties of the potential surface. The delicateness of the probe will improve as the photon energy approaches the threshold energy for dissociation.
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Bersohn et al. (1988) studied this question.
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