Accurate determination of the scattering length of metastable Helium atoms using dark resonances between atoms and exotic molecules

Details Accurate determination of the scattering length of metastable Helium atoms using dark resonances between atoms and exotic molecules Accurate determination of the scattering length of metastable Helium atoms using dark resonances between atoms and exotic molecules

2005-09-12

arxiv.org/abs/cond-mat/0509286v2

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.96.023203

We present a new measurement of the s-wave scattering length a of spin-polarized helium atoms in the 2^3S_1 metastable state. Using two-photon photoassociation spectroscopy and dark resonances we measure the energy E_{v=14}= -91.35 +/- 0.06 MHz of the least bound state v=14 in the interaction potential of the two atoms. We deduce a value of a = 7.512 +/- 0.005 nm, which is at least one hundred times more precise than the best previous determinations and is in disagreement with some of them. This experiment also demonstrates the possibility to create exotic molecules binding two metastable atoms with a lifetime of the order of 1 microsecond.

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