Abstract
The theoretical origin of nonexponential decays is discussed, especially with regard to the role of the exciting light source in the narrow band limit of excitation. For coherent light sources the bandwidth of excitation is crucial to observing nonexponentiality. A simple discussion of incoherent light sources is presented and the effect of incoherence on the non-exponential decays investigated. Even with incoherent light, one may still observe nonexponential decays under certain conditions of bandwidth and time duration of the exciting pulse. Finally, the effect of Doppler broadening is briefly discussed.
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