Issue Eur. Phys. J. D Volume 26, Number 2, October II 2003 Page(s) 155 - 164 Section Molecular Physics and Chemical Physics DOI 10.1140/epjd/e2003-00208-4 Published online 15 July 2003

Eur. Phys. J. D 26, 155-164 (2003)
DOI: 10.1140/epjd/e2003-00208-4

Experimental study of the Ca S S asymptote

O. Allard, C. Samuelis, A. Pashov, H. Knöckel and E. Tiemann

Institut für Quantenoptik, Universität Hannover, Welfengarten 1, 30167 Hannover, Germany

allard@iqo.uni-hannover.de

(Received 17 January 2003 / Received in final form 2nd April 2003 Published online 15 July 2003)

Abstract
The van der Waals coefficients C ₆, C ₈ and C ₁₀ at the ¹S +¹S calcium dimer asymptote are determined from spectroscopic observations. The filtered laser excitation technique was applied for measuring transition frequencies of the Ca ₂ B-X system from asymptotic levels of the X ground state reaching v''=38. That level which is only 0.2 cm ^-1 below the molecular ¹S +¹S asymptote has an outer classical turning point of about 20 Å. The extraction of confidence limits for the long range coefficients including the dissociation energy from the experimental data involving Monte Carlo simulation is described. A range for the s-wave scattering length is derived.

PACS
31.50.Bc - Potential energy surfaces for ground electronic states.
33.20.Kf - Visible spectra.
33.20.Vq - Vibration-rotation analysis.
33.50.Dq - Fluorescence and phosphorescence spectra.

© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2003

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