Laboratory modelling of the physico-chemical processes in the cosmic gas-dust clouds

The preliminary results of an experiment on the complex laboratory modelling of the physico-chemical processes proceeding in the interstellar gas clouds are presented. The purpose of the modelling is an analysis of the molecule formation and dissociation processes kinetics. The basic component of the modelling system is 10 cm diameter spherical container with cooled walls (the dust particles surface analogue). The high frequency discharger (the discharge region - the H2 zone analogue) is placed in the central part of the container. The container contains the mixture of simple gases: 10-1 Tor of H2 and He, 10-2 Tor of CO, O2 and N2 and 0.5x10-2 Tor of H2S (an analogue of the H1 zone). The reactions are induced by the electrodeless high-frequency discharge (f=20 MHz) with the discharge power of 0.1-1 W. The resulting mixture has been analyzed by the high-resolution magnetic resonance mass spectrometer. (M/ΔM=2x104) with an electron impact source. It is shown that, in the reactions of the formation of many on the interstellar molecules, the on the cold dust surface reactions rather than the gas-phase reactions may play the dominant role