Ortho-Para H2 Conversion by Proton Exchange at Low Temperature: An Accurate Quantum Mechanical Study

Details Ortho-Para H2 Conversion by Proton Exchange at Low Temperature: An Accurate Quantum Mechanical Study Ortho-Para H2 Conversion by Proton Exchange at Low Temperature: An Accurate Quantum Mechanical Study

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011phrvl.107b3201h&link_type=abstract

Physical Review Letters, vol. 107, Issue 2, id. 023201

Astronomy and Astrophysics

Astrophysics

3

Chemical Reactions, Energy Disposal, And Angular Distribution, As Studied By Atomic And Molecular Beams, Quantum Theory Of Reaction Cross Section, Rate Constants, Reaction Cross Sections, And Activation Energies, Molecular And Chemical Processes And Interactions

Scientific paper

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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