Frequency dependence of spectral diffusion in hole-burning systems: resonant effects of infrared radiation

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Abstract
Light-induced spectral diffusion in photochemical hole-burning systems is investigated with respect to its dependence on the frequency of the irradiated light in the wavelength range between 2 and 5 μm. The investigated systems are protonated and deuterated polymethyl methacrylate (PMMA) matrices doped with metal-free phthalocyanine (H2Pc). Resonant hole-filling and resonant hole-broadening behaviors are found, both being caused by the excitation of local, but different, matrix vibrations. Possible mechanisms are discussed under the aspect of the excitation of IR- and Raman-active vibrations of the matrix.