ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Integral cross sections for the reaction of C+ with hydrogen have been determined as a function of translational and rotational energy. Measurements were made with a guided beam apparatus, using a temperature variable scattering cell or alternatively a nozzle beam and different ortho–para mixtures of H2. The detailed results are in good agreement with statistical phase space calculations provided that the nuclear spins are assumed to be completely decoupled (frozen spin approximation). One consequence of fundamental interest is that H2( j=1) is less reactive than H2( j=0) in the threshold region. Further, the theory predicts an oscillatory structure for the kinetic energy dependence of the reaction cross section which has been observed for the first time. The calculated cross sections are used to predict reliable rate coefficients for H2 in selected rotational ( j=0–7) states. An analytical approximation of these results allows a simple calculation of rate coefficients for nonequilibrium rotational populations as can be found, e.g., in interstellar space.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.453580
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