Abstract
The fluorescence excitation spectra of small and dilute samples of solid solutions kept at helium temperatures display sharp homogeneous lines of individual solute molecules. Single molecule lines are sensitive to external perturbations such as electric fields or pressure. The fluctuations of the fluorescence signal show characteristic times ranging from nanoseconds to minutes. They give information about the dynamics within the molecule (intersystem crossing, Rabi nutation) as well as in the surrounding matrix (spectral diffusion of the resonance frequency).
© 1996 IEEE
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