Issue Eur. Phys. J. D Volume 31, Number 2, November 2004 Ultracold Polar Molecules: Formation and Collisions Page(s) 205 - 211 Section Special Issue: Ultracold Polar Molecules: Formation and Collisions DOI 10.1140/epjd/e2004-00156-5 Published online 23 November 2004

Eur. Phys. J. D 31, 205-211 (2004)
DOI: 10.1140/epjd/e2004-00156-5

Spectroscopic studies of NaCs for the ground state asymptote of Na + Cs pairs

O. Docenko¹, M. Tamanis¹, R. Ferber¹, A. Pashov², H. Knöckel³ and E. Tiemann<sup>3

1</sup>  Department of Physics and Institute of Atomic Physics and Spectroscopy, University of Latvia, Rainis Boulevard 19, LV 1586 Riga, Latvia
²  Institute for Scientific Research in Telecommunications, ul. Hajdushka poliana 8, 1612 Sofia, Bulgaria
³  Institut für Quantenoptik, Universität Hannover, Welfengarten 1, 30167 Hannover, Germany

tiemann@iqo.uni-hannover.de

(Received 29 June 2004 / Received in final form 10 September 2004 / Published online 23 November 2004)

Abstract
The ground state X of NaCs was studied by laser induced fluorescence Fourier-transform spectroscopy. An accurate potential energy curve was derived from more than 5000 transitions. This potential reproduces the experimental observations within their uncertainties of and covers about 99.97% of the potential well depth. Few vibrational levels of the shallow state a below the atomic ground state asymptote were observed. The identification is mainly done by the observed and quantitatively interpreted molecular hyperfine structure applying atomic parameters of the ground states of Na and Cs. An estimated potential curve for a is reported which can be used together with that of X for coupled channel calculations of cold collisions between Na and Cs. An example is given.

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 2004

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