This paper investigates the stereodynamics of the reaction He+HD + by the quasi-classical trajectory (QCT) method using the most accurate AQUILANTI surface Mol. Phys. 98 1835. The distribution P (φr) of dihedral angle and the distribution P (θr) of angle between k and j have been presented at three different collision energies. Four generalized polarization-dependent differential cross-sections (2π/σ)(dσ 00 /dωt), (2π/σ)(dσ 20 /dωt), (2π/σ)(dσ 22+ /dωt), (2π/σ)(dσ 21− /dωt) are also calculated. Some interesting results are obtained from the comparison of the stereodynamics of the title reaction at different collision energies.

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.

Laser pulses interaction with tobacco mosaic virus (TMV) in Tris-HCl pH7.5 buffer and in water has been investigated. 20 ns ruby laser pulses have been used for excitation. Spectrum of the light passing through the sample was registered with the help of Fabri-Perot interferometer. In the case of TMV in water we observed in the spectrum only one line of the exciting laser light, for TMV in Tris-HCl pH7.5 buffer second line appeared, corresponding to the stimulated low-frequency Raman scattering (SLFRS) on the breathing radial mode of TMV. SLFRS frequency shift by 2 cm -1 , (60 GHz), conversion efficiency and threshold are measured for the first time to the best of our knowledge.

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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