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Inelastic collisions in para-H2: Translation-rotation state-to-state rate coefficients and cross sections at low temperature and energy

AuthorsMaté, Belén ; Thibault, Franck; Tejeda, Guzmán ; Fernández Sánchez, José María ; Montero, Salvador
KeywordsMolecule-molecule collisions
Rotational-vibrational energy transfer
Hydrogen neutral molecules
Ground states
Issue Date3-Feb-2005
PublisherAmerican Institute of Physics
CitationJ. Chem. Phys. 122: 064313 (2005)
AbstractWe report an experimental determination of the k(00-->02) rate coefficient for inelastic H2:H2 collisions in the temperature range from 2 to 110 K based on Raman spectroscopy data in supersonic expansions of para-H2. For this purpose a more accurate method for inverting the master equation of rotational populations is presented. The procedure permits us to reduce the measured k(00-->02) rate coefficient to the corresponding σ(00-->02) cross section in the range of precollisional energy from 360 to 600 cm–1. Numerical calculations of σ(00-->02) carried out in the frame of the coupled channel method are also reported for different intermolecular potentials of H2. A good agreement is found between the experimental cross section and the numerical one derived from Diep and Johnson's potential [J. Chem. Phys. 112, 4465 (2000)].
Description8 pages, 5 figures.-- PACS nrs.: 34.50 Ez.
Publisher version (URL)http://dx.doi.org/10.1063/1.1850464
Appears in Collections:(CFMAC-IEM) Artículos
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