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Collision kernels from velocity-selective optical pumping with magnetic depolarization

Author(s)
Bhamre, T.; Kominis, I. K.; McGuyer, B. H.; Happer, W.; Marsland, Robert Alvin
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Abstract
We experimentally demonstrate how magnetic depolarization of velocity-selective optical pumping can be used to single out the collisional cusp kernel best describing spin- and velocity-relaxing collisions between potassium atoms and low-pressure helium. The range of pressures and transverse fields used simulate the optical pumping regime pertinent to sodium guidestars employed in adaptive optics. We measure the precession of spin-velocity modes under the application of transverse magnetic fields, simulating the natural configuration of mesospheric sodium optical pumping in the geomagnetic field. We also provide a full theoretical account of the experimental data using the recently developed cusp kernels, which realistically quantify velocity damping collisions in this optical pumping regime. A single cusp kernel with a sharpness s = 13 ± 2 provides a global fit to the K-He data.
Date issued
2013-04
URI
http://hdl.handle.net/1721.1/88737
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review A
Publisher
American Physical Society
Citation
Bhamre, T., R. Marsland, I. Kominis, B. McGuyer, and W. Happer. "Collision kernels from velocity-selective optical pumping with magnetic depolarization." Phys. Rev. A 87, 043412 (April 2013). © 2013 American Physical Society
Version: Final published version
ISSN
1050-2947
1094-1622

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