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The experimental investigations devoted to the Na-D spectral line broadening by molecular gases are reviewed. The theoretical interpretation of the data within the framework of the classical theory of atomic spectral line broadening is given. The e †ect of adiabatic and diabatic collisions on the shape of both impact and quasi-static spectral-line wings is discussed. The di †erent forms of spectral-line shape representation and the connections between them are considered. The experimental cross-sections of the Lorentzian broadening of the Na-D lines by molecules are presented and compared with the theoretical ones. The problem of restoration of the adiabatic interaction potentials from quasi-static wing proÐles is noted. The C 6 , parameters of the e †ective atom-molecular potentials of the Lennard-C 12 Jones 12-6 form, restored on quasi-static wing proÐles, are presented.

Abstract. There are presented the results of investigation of exothermal effect taking place during torrefaction process. Experiments were carried out with the help of thermoanalyzer SDT Q600, that gives opportunity to use methods of differential thermogravimetric analysis and differential scanning calorimetry, and at the lab-scale installation modelling the columntype torrefaction reactor with indirect (through the wall) heating of processable raw material. It was ascertained the correspondence between the processes of thermal decomposition of basic organic components of wood (hemicellulose, cellulose and lignin) and the characteristic endoand exothermic peaks on the curve of effective heat capacity. It was shown that the exothermal effect accompanying thermal decomposition of hemicellulose, taking place during torrefaction, may lead to spontaneous heating of wood biomass to temperatures significantly exceeding the wall temperature.