Electronic and rotational energy transfer in F(2P1/2)+H2 collisions at ultracold temperatures

Details Electronic and rotational energy transfer in F(2P1/2)+H2 collisions at ultracold temperatures Electronic and rotational energy transfer in F(2P1/2)+H2 collisions at ultracold temperatures

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jchph.117..118k&link_type=abstract

The Journal of Chemical Physics, vol. 117, iss. no. 1, p. 118-123

Physics

Chemical Physics

14

Atomic Collisions, Atomic Interactions, Energy Transfer, Excitation, Fluorine, Hydrogen, Molecular Collisions, Molecular Gases, Molecular Interactions, Spin-Orbit Interactions, Vibration, Rotational And Vibrational Energy Transfer, Atom And Radical Reactions, Chain Reactions, Molecule-Molecule Reactions

Scientific paper

The dynamics of F(2P1/2)+H2 scattering at ultracold temperatures is studied. It is shown that both the rotational and vibrational excitation of H2 molecules decrease substantially the efficiency of spin-orbit relaxation in F+H2 collisions. It is observed that the near-resonant electronic transition leading to rotational excitation of H2)(j=0 is of the same magnitude at high energies as the off-resonant transition in which the rotational angular momentum of H2 is preserved but becomes dominant in ultracold collisions. The zero temperature rate constant for spin-orbit relaxation of F is computed and suggestions are made as to the chemical reactivity of F(2P1/2) atoms at ultracold temperatures. It is found that rotational relaxation of excited H2 molecules is significantly enhanced by electronic transitions in F atoms and the electronic relaxation in F(2P1/2)+H2)(j>0 collisions is suppressed by rotational relaxation of H2.

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