dorsal/arxiv
View SchemaFrequency shifts of photoassociative spectra of ultracold metastable Helium atoms : a new measurement of the s-wave scattering length
| Authors | J. Kim, S. Moal, M. Portier, J. Dugué, M. Leduc, C. Cohen-Tannoudji |
|---|---|
| Categories | |
| ArXiv ID | physics/0507180 |
| URL | https://arxiv.org/abs/physics/0507180 |
| DOI | 10.1209/epl/i2005-10275-y |
Abstract
We observe light-induced frequency shifts in one-color photoassociative spectra of magnetically trapped $^4$He$^*$ atoms in the metastable $2^3S_1$ state. A pair of ultracold spin-polarized $2^3S_1$ helium atoms is excited into a molecular bound state in the purely long range $0_u^+$ potential connected to the $2^3S_1 - 2^3P_0$ asymptote. The shift arises from the optical coupling of the molecular excited bound state with the scattering states and the bound states of two colliding $2^3S_1$ atoms. We measure the frequency-shifts for several ro-vibrational levels in the $0^+_u$ potential and find a linear dependence on the photoassociation laser intensity. Comparison with a theoretical analysis provides a good indication for the s-wave scattering length $a$ of the quintet ($^5\Sigma_g^+$) potential, $a=7.2\pm 0.6$ nm, which is significantly lower than most previous results obtained by non-spectroscopic methods.
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"abstract": "We observe light-induced frequency shifts in one-color photoassociative\nspectra of magnetically trapped $^4$He$^*$ atoms in the metastable $2^3S_1$\nstate. A pair of ultracold spin-polarized $2^3S_1$ helium atoms is excited into\na molecular bound state in the purely long range $0_u^+$ potential connected to\nthe $2^3S_1 - 2^3P_0$ asymptote. The shift arises from the optical coupling of\nthe molecular excited bound state with the scattering states and the bound\nstates of two colliding $2^3S_1$ atoms. We measure the frequency-shifts for\nseveral ro-vibrational levels in the $0^+_u$ potential and find a linear\ndependence on the photoassociation laser intensity. Comparison with a\ntheoretical analysis provides a good indication for the s-wave scattering\nlength $a$ of the quintet ($^5\\Sigma_g^+$) potential, $a=7.2\\pm 0.6$ nm, which\nis significantly lower than most previous results obtained by non-spectroscopic\nmethods.",
"arxiv_id": "physics/0507180",
"authors": [
"J. Kim",
"S. Moal",
"M. Portier",
"J. Dugu\u00e9",
"M. Leduc",
"C. Cohen-Tannoudji"
],
"categories": [
"physics.atom-ph",
"cond-mat.other"
],
"doi": "10.1209/epl/i2005-10275-y",
"title": "Frequency shifts of photoassociative spectra of ultracold metastable Helium atoms : a new measurement of the s-wave scattering length",
"url": "https://arxiv.org/abs/physics/0507180"
},
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