Europhys. Lett.
Volume 66, Number 4, May 2004
Page(s) 485 - 491
Section Atomic and molecular physics
Published online 01 May 2004
Europhys. Lett., 66 (4) , pp. 485-491 (2004)
DOI: 10.1209/epl/i2003-10241-9

Rubidium pure long-range ion-pair molecules

T. Ban, R. Beuc, H. Skenderovic and G. Pichler

Institute of Physics - Bijenicka cesta 46, P.O. Box 304 HR-10001 Zagreb, Croatia

(Received 25 September 2003; accepted in final form 26 March 2004)

The $\chem{Rb_2}$ ion-pair satellite band located in the blue wing of the rubidium second resonance doublet line was observed in the absorption measurements of a dense rubidium vapor. The observed satellite band was identified as a long-range ion-pair state, by using the $\chem{Rb_2}$ long-range potential curves based on ab initio calculations. In order to perform the semiclassical spectral simulations of the observed satellite band, the relevant $\chem{Rb_2}$ long-range potential curves and corresponding molecular dipole oscillator strengths were calculated using the asymptotic method. The importance of the observed satellite band (long-range ion-pair state) is discussed in connection with the formation of $\chem{Rb_2}$ ultracold molecules.

33.70.Ca - Oscillator and band strengths, lifetimes, transition moments, and Franck-Condon factors.
33.80.Ps - Optical cooling of molecules; trapping.
33.80.Gj - Diffuse spectra; predissociation, photodissociation.

© EDP Sciences 2004