Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 123, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2060710
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The role of van der Waals forces in O(P-3)+H-2(upsilon=1,j=0) collisions is investigated theoretically at low and ultralow temperatures. Quantum scattering calculations have been performed for zero total angular momentum using the lowest London-Eyring-Polanyi-Sato double-polynomial (3)A('') potential-energy surface reported by [Rogers , J. Phys. Chem. A 104, 2308 (2000)] and its recent BMS1 and BMS2 extensions developed by [Brandao , J. Chem. Phys. 121, 8861 (2004)] which provide a more accurate treatment of the van der Waals interaction. Our calculations show that van der Waals forces strongly influence chemical reactivity at ultracold translational energies. The presence of a zero-energy resonance for the BMS1 surface is found to enhance reactivity in the ultracold regime and shift the Wigner threshold to lower temperatures. (c) 2005 American Institute of Physics.
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