arXiv subjects
Publications and source records attributed to V. A. Kuz'menko.
Two alternative hypotheses try to explain the origin of the continuum. The present communication gives new argument in favor of the dimer hypothesis. This argument is based on the existence of the wide component of line in absorption spectrum of polyatomic molecules.
The results of experimental testing the existence of intense Lorentzian--like wings with FWHM $\sim 4.5 cm^{-1}$ in the absorption spectra of polyatomic molecules in a gas phase are presented. Two independent experimental methods were used for evaluating the integral intensity of the line wings for a number of substances. In the first case, the cross--section of the far wings of absorption bands in a gas phase spectrum were measured. Then, these band wings were extrapolated inside the contour of absorption band. In the second case, the saturation degree of the linear spectrum of molecules was determined. Radiation of a pulsed $CO_2$--laser was used at low gas pressure ($\sim 16$ mtorr) and averaged excitation level of molecules ${ }\sim 0.1$ quanta/molecule. The values obtained by these two independent methods coincide for a variety of molecules. The average relative integral intensity of the line wings varied from $\sim 0.6%$ for $SF_6$ and $SiF_4$ to $\sim 90%$ for $(CF_3)_2O$ and $(CF_3)_2CO$.
The physical nature of the fluorescence depletion (FD) effect and the possible way of its experimental study are discussed.
The physical nature of the photon mixing and photon echo processes is discussed on the basis of inequality of the forward and backward optical transitions.
Time invariance problem of a photon absorption process in atoms and molecules is discussed.
Infrared-infrared double resonance measurements of the $ν_3$ absorption band of $SF_6$ using a $CO_2$ TEA laser radiation have been carried out. The results obtained in the present and in some earlier works are discussed taking into account existence of a wide component of lines, nondegenerative four photon mixing (NFPM) and time invariance violation in the photon-molecule interactions. It is proposed to use the NFPM effect in investigations of the shape of the optical transition in polyatomic molecules and especially for evaluation of the homogeneous width of the wide component of lines. The need and problems of experimental study of existing effects of the T-invariance violation in optics are discussed.
A direct experimental proof of very strong T-invariance violation in interactions of the photons with atoms and molecules exists in the molecular physics.