Determination of the calcium ground state scattering length by photoassociation spectroscopy at large detunings
Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
2 Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany
Corresponding author: a email@example.com
Published online: 1 June 2007
Photoassociation spectroscopy was used to determine the s-wave scattering length of 40Ca atoms in their electronic ground state. Vibrational levels were observed in an extended range of up to 182 GHz below the dissociation limit 4s21S0–4s4p 1P1. Thus, the frequency interval was nearly tripled, in which photoassociation was observed compared to previous measurements. The spectra were analyzed by means of quantum mechanical simulations. With the new data it was possible to resolve the discrepancy concerning the ground state scattering length presented in earlier publications [Phys. Rev. A 67, 043408 (2003); Eur. Phys. J. D 26, 155 (2003)]. An improved dipole-dipole coupling constant C3Σ = 0.52306(20) ×103 cm-1 nm3 is obtained.
PACS: 32.80.Pj – Optical cooling of atoms; trapping / 34.50.Rk – Laser-modified scattering and reactions / 34.10.+x – General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007