Dynamics of the S(1D2)+HD(j=0) reaction at collision energies approaching the cold regime: a stringent test for theory

We report integral cross sections for the S(1D2)+HD(j=0)→DS+H and HS+D reaction channels obtained through crossed-beam experiments reaching collision energies as low as 0.46 meV and from adiabatic time-independent quantum-mechanical calculations. While good overall agreement with experiment at energ...

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Bibliographic Details
Published in:Physical review letters 2012-09, Vol.109 (13), p.133201-133201, Article 133201
Main Authors: Lara, Manuel, Chefdeville, Simon, Hickson, Kevin M, Bergeat, Astrid, Naulin, Christian, Launay, Jean-Michel, Costes, Michel
Format: Article
Language:English
Subjects:
Biochemistry, Molecular Biology
Biological Physics
Biophysics
Life Sciences
Physics
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Summary:We report integral cross sections for the S(1D2)+HD(j=0)→DS+H and HS+D reaction channels obtained through crossed-beam experiments reaching collision energies as low as 0.46 meV and from adiabatic time-independent quantum-mechanical calculations. While good overall agreement with experiment at energies above 10 meV is observed, neither the product channel branching ratio nor the low-energy resonancelike features in the HS+D channel can be theoretically reproduced. A nonadiabatic treatment employing highly accurate singlet and triplet potential energy surfaces is clearly needed to resolve the complex nature of the reaction dynamics.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.109.133201