Gas-chromatographic analysis of the chemical composition of the Venusian atmosphere on the descent modules of the Venera-13 and Venera-14 probes

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Atmospheric Composition, Gas Chromatography, Planetary Composition, Satellite-Borne Instruments, Venera Satellites, Venus Atmosphere, Abundance, Block Diagrams, Gas Density, Gas Detectors, Landing Modules, Vertical Distribution, Volumetric Analysis

Scientific paper

The Sigma-2 gas-chromatograph developed for the analysis of the chemical composition of the Venusian atmosphere on the Venera 13, 14 descent modules is described, and a block diagram of Sigma-2 is presented. The presence of analysis channels with neon and electron-capture detectors made it possible to duplicate the analysis of several components and to determine the content of oxygen and argon in the atmosphere without chromatographic separation of these components. Volume concentrations (matched to heights of sampling) are presented for H2, O2, Kr, H2O, H2S, COS, and SF6 (N2O).

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