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28th International Symposium on Rarefied Gas Dynamics 2012. AIP Conf. Proc. (2012); 9 pags. ; 5 figs. ; 3 tabs. ; PACS: 47.40 Ki, 34.50 Ez, 33.20 FbThe stagnation conditions for production of pure H2O and H2O+He supersonic jets free of condensation are reported. Number densities and rotational populations of uncondensed H2O+He jets have been measured by Raman spectroscopy. This diagnostics is aimed at characterizing quantitatively the main  ow properties: number densities, rotational and\udtranslational temperatures,  ow velocity, rotational populations and their gradients along the jet. Combining these data in a\udMaster Equation accounting for the evolution of rotational populations along the jet, a description has been shown feasible\udin terms of average rate coef cients for inelastic collisions, a novel concept which simpli es considerably the molecular interpretation of non-equilibrium and relaxation. Experimental average rates for H2O:He inelastic collisions are in the range of 340 to 700×10−20 m3s−1, somewhat larger than the corresponding values from ab-initio calculations. Rates for H2O:H2O inelastic collisions are 4 to 7 times larger than for H2O:He collisions. C 2012 American Institute of PhysicsThis work has been supported by the Spanish Ministerio de Ciencia e Innovación (MICINN), Research Projects CONSOLIDER ASTROMOL CSD2009-0038, and FIS2010-22064.Peer reviewe

Diagnostics of H[sub 2]O and H[sub 2]O+He supersonic jets by Raman spectroscopy