Abstract
Described is a series of six single-molecule spectra of terrylene in Shpol'skii matrix n-decane recorded during 1.5 h at 1.7 K, after cooling the sample down from the room temperature. The spectra reveal single-molecule lines with different rates of spectral jumps. One of these lines, remarkably unstable at the beginning of the measurements, became much more stable after relaxation of the sample at a constant temperature for about 1.5 h. Such a behaviour demonstrates that low-temperature relaxation of the nonequilibrium energy stored during the cooling of a sample can play an important role in processes of spectral diffusion.
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