Analysis of light-induced frequency shifts in the photoassociation of ultracold metastable helium atoms

Details Analysis of light-induced frequency shifts in the photoassociation of ultracold metastable helium atoms Analysis of light-induced frequency shifts in the photoassociation of ultracold metastable helium atoms

2006-04-12

arxiv.org/abs/cond-mat/0604312v2

Journal of Physics B 39 (25/09/2006) S881

Physics

Condensed Matter

Other Condensed Matter

28 pages, 7 figures, submitted to the special issue on Cold Molecules of J. Phys. B

Scientific paper

10.1088/0953-4075/39/19/S06

We present an exhaustive analysis of the light-induced frequency shifts of the photoassociation lines of ultracold metastable 4He* atoms in a magnetic trap. The measurements of the shifts of several vibrational levels bound in the purely long-range J=1,0u+ potential linked to the 23S1-23P0 asymptote were reported in a previous paper and are analyzed here. The simplicity of this system makes it very appropriate for a detailed study. Indeed, the purely long-range character of the excited potential allows one to calculate exact excited molecular wavefunctions and to use asymptotic expansions at large internuclear distances of the ground state wavefunctions appearing in Franck-Condon type integrals. Moreover, the number of collisional channels to be considered is strongly reduced by the absence of hyperfine structure for 4He* and the use of polarized ultracold atoms and polarized light. This allows us to derive semi-analytical expressions for the shifts showing explicitly their linear dependences on the s-wave scattering length a of spin polarized metastable 4He* atoms. This explains how it is possible to derive the measurement of a from these shifts.

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