Ortho-Para H2 Conversion by Proton Exchange at Low Temperature: An Accurate Quantum Mechanical Study
Résumé
We report extensive, accurate fully quantum, time-independent calculations of cross sections at low collision energies, and rate coefficients at low temperatures for the H++H2(v=0,j)→H++H2(v=0,j') reaction. Different transitions are considered, especially the ortho-para conversion (j=1→j'=0) which is of key importance in astrophysics. This conversion process appears to be very efficient and dominant at low temperature, with a rate coefficient of 4.15×10-10cm3molecule-1s-1 at 10 K. The quantum mechanical results are also compared with statistical quantum predictions and the reaction is found to be statistical in the low temperature regime (T<100K).
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