Homonuclear ionizing collisions of laser-cooled metastable helium atoms

Details Homonuclear ionizing collisions of laser-cooled metastable helium atoms Homonuclear ionizing collisions of laser-cooled metastable helium atoms

2006-01-18

arxiv.org/abs/cond-mat/0601414v1

Phys. Rev. A73, 032713 (2006)

Physics

Condensed Matter

Other Condensed Matter

15 pages, 6 figures, submitted to Phys. Rev. A

Scientific paper

10.1103/PhysRevA.73.032713

We present a theoretical and experimental investigation of homonuclear ionizing collisions of laser-cooled metastable helium atoms, considering both the fermionic He-3 and bosonic He-4 isotope. The theoretical description combines quantum threshold behavior, Wigner's spin-conservation rule and quantum statistical symmetry requirements in a single-channel model, complementing a more complete close-coupling theory that has been reported for collisions of metastable He-4 atoms. The model is supported with measurements (in the absence of light fields) of ionization rates in magneto-optically trapped samples, that contain about 3*10^8 atoms of a single isotope. The ionization rates are determined from measurements of trap loss due to light-assisted collisions combined with comparative measurements of the ion production rate in the absence and presence of trapping light. Theory and experiment show good agreement.

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