We report the results of an experimental study on the temporal and spectral response of organic liquids luminescence excited by UV radiation at liquid-nitrogen temperature. The afterglow at liquid-nitrogen temperature was detected with a decay time of the order of 1000 ms. We have revealed that the afterglow appears at a definite temperature of about 80 K.

The interaction of laser pulses with the Cauliflower mosaic virus (CaMV) in a Tris-HCl pH7.5 buffer is investigated. 20 ns ruby laser pulses are used for excitation. Spectra of the light passing through the sample and reflected from it are registered with the help of a Fabri-Perot interferometer. Stimulated low-frequency Raman scattering (SLFRS) in a CaMV suspension is registered. The SLFRS frequency shift, conversion efficiency and threshold are measured for the first time, to the best of our knowledge.

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