P F Weck and N Balakrishnan 2006 J. Phys. B: At. Mol. Opt. Phys. 39 S1215 doi:10.1088/0953-4075/39/19/S28
P F Weck and N Balakrishnan
Show affiliationsThe main characteristics of cold and ultracold chemical reactions are reviewed through the illustrative study of the O(3P) + H2 reaction dynamics. Using separate analytic representations of the lowest H2O(3A'') electronic state which differ essentially by their descriptions of long-range forces, quantum-mechanical scattering calculations show the crucial role played by the van der Waals interaction potential in chemical reactions at low temperatures. Furthermore, the presence of zero-energy resonances is found to significantly enhance chemical reactivity in the ultracold regime. At translational energies comparable to the well depth of the van der Waals potential, initial-state-selected probabilities and excitation functions are characterized by Feshbach resonances arising from the decay of quasibound states supported by the van der Waals well in the entrance channel of the reaction.
82.30.Cf Atom and radical reactions; chain reactions; molecule-molecule reactions
34.20.Gj Intermolecular and atom-molecule potentials and forces
82.20.Kh Potential energy surfaces for chemical reactions
82.60.-s Chemical thermodynamics
82.20.Xr Quantum effects in rate constants (tunneling, resonances, etc.)
Issue 19 (14 October 2006)
Received 27 March 2006
Published 25 September 2006
A Corrigendum for this article has been published in 2006 J. Phys. B: At. Mol. Opt. Phys. 39 5023
P F Weck and N Balakrishnan 2006 J. Phys. B: At. Mol. Opt. Phys. 39 S1215
Benhui Yang et al 2006 J. Phys. B: At. Mol. Opt. Phys. 39 S1229
Gary Shiu 2005 J. Phys.: Conf. Ser. 18 188
Harald Atmanspacher et al 2003 J. Phys. A: Math. Gen. 36 9899
G Jolicard et al 2003 J. Phys. B: At. Mol. Opt. Phys. 36 2777
P A Grassi et al 2003 Class. Quantum Grav. 20 S395
Andreas U Schmidt 2003 J. Phys. A: Math. Gen. 36 1135
V A Sashin et al 2001 J. Phys.: Condens. Matter 13 4203
C Chen et al 2005 J. Phys.: Condens. Matter 17 7689
Daniel Cartin et al 2004 Class. Quantum Grav. 21 4495