Volume 72, Number 4, November 2005
|Page(s)||548 - 554|
|Section||Atomic and molecular physics|
|Published online||14 October 2005|
Frequency shifts of photoassociative spectra of ultracold metastable helium atoms: A new measurement of the -wave scattering length
Ecole Normale Supérieure and Collège de France, Laboratoire Kastler Brossel 24 rue Lhomond, 75231 Paris Cedex 05, France
Accepted: 20 September 2005
We observe light-induced frequency shifts in one-color photoassociative spectra of magnetically trapped atoms in the metastable state. A pair of ultracold spin-polarized helium atoms is excited into a molecular bound state in the purely long-range potential connected to the - 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 atoms. We measure the frequency-shifts for several ro-vibrational levels in the 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 () potential, , which is significantly lower than most previous results obtained by non-spectroscopic methods.
PACS: 32.80.Pj – Optical cooling of atoms; trapping / 33.20.Ea – Infrared spectra / 34.20.Cf – Interatomic potentials and forces
© EDP Sciences, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.