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Spectral diffusion (SD) in PMMA doped with H 2 -TPP is investigated at 4.2K on a time scale of 3–106s via optical hole burning. Two contradictory results – within the framework of the TLS model – are obtained. The first one is the absence of aging effects which puts the upper limit for the TLS relaxation times to tens of minutes. The second one is an intensive superlogarithmic SD on the whole...