{
  "annotation_id": "945f240f-de59-4ab6-82b5-fbdb8040a666",
  "date_created": "2026-03-02T18:01:00.646000Z",
  "date_modified": "2026-03-02T18:01:00.646000Z",
  "file_hash": "fb1627fbf9159e03fdb4ac0a2cd5aa129e2cd29009d363b920ffec5edc8b19ff",
  "private": false,
  "record": {
    "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"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "bfe9ee6b-b53d-4c1a-aced-57effdede59f",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}