Heteronuclear ionizing collisions between laser-cooled metastable helium atoms

Details Heteronuclear ionizing collisions between laser-cooled metastable helium atoms Heteronuclear ionizing collisions between laser-cooled metastable helium atoms

2007-01-17

arxiv.org/abs/physics/0701194v1

Physics

Atomic Physics

8 pages, 6 figures

Scientific paper

10.1103/PhysRevA.75.062715

We have investigated cold ionizing heteronuclear collisions in dilute mixtures of metastable (2 3S1) 3He and 4He atoms, extending our previous work on the analogous homonuclear collisions [R. J. W. Stas et al., PRA 73, 032713 (2006)]. A simple theoretical model of such collisions enables us to calculate the heteronuclear ionization rate coefficient, for our quasi-unpolarized gas, in the absence of resonant light (T = 1.2 mK): K34(th) = 2.4*10^-10 cm^3/s. This calculation is supported by a measurement of K34 using magneto-optically trapped mixtures containing about 1*10^8 atoms of each species, K34(exp) = 2.5(8)*10^-10 cm^3/s. Theory and experiment show good agreement.

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