Quantum and Semiclassical Calculations of Cold Atom Collisions in Light Fields

Details Quantum and Semiclassical Calculations of Cold Atom Collisions in Light Fields Quantum and Semiclassical Calculations of Cold Atom Collisions in Light Fields

1997-08-07

arxiv.org/abs/physics/9708011v1

Phys. Rev. A 57, 3724-3738

Physics

Atomic Physics

21 pages, RevTex, 7 eps figures embedded using psfig, see also http://www.physics.helsinki.fi/~kasuomin/

Scientific paper

10.1103/PhysRevA.57.3724

We derive and apply an optical Bloch equation (OBE) model for describing collisions of ground and excited laser cooled alkali atoms in the presence of near-resonant light. Typically these collisions lead to loss of atoms from traps. We compare the results obtained with a quantum mechanical complex potential treatment, semiclassical Landau-Zener models with decay, and a quantum time-dependent Monte-Carlo wave packet (MCWP) calculation. We formulate the OBE method in both adiabatic and diabatic representations. We calculate the laser intensity dependence of collision probabilities and find that the adiabatic OBE results agree quantitatively with those of the MCWP calculation, and qualitatively with the semiclassical Landau-Zener model with delayed decay, but that the complex potential method or the traditional Landau-Zener model fail in the saturation limit.

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