Relaxation at Cell Walls in Optical-Pumping Experiments

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Abstract
Franzen's approximation for the relaxation time of an optically pumped vapor is shown to yield effective values of diffusion coefficients and relaxation cross sections which differ by small predictable amounts from the true values of these parameters. The appropriate correction factors have been calculated. Relaxation at cell walls is shown to be approximated well by an additive relaxation rate, allowing a simple description of the relaxation of the electronic spin polarization of atoms subject to collisions both with cell walls and with buffergas atoms.