Electronic Absorption Spectra of the RbAr Van der Waals Complex

Abstract

The potential energy curves of the ground state and many excited states of the RbAr van der Waals complex have been determined using [Rb + ] and [e-Ar] pseudopotentials with the inclusion of core polarization operators on both atoms. This has reduced the number of active electrons of the RbAr system to only one valence electron, permitting the use of large basis sets for both the Rb and Ar atoms. Potential energy curves of the ground state and many excited states have been calculated at the SCF level. The core-core interactions for Rb + Ar are included using the accurate CCSD potential of Hickling et al [Hickling, H.;Viehland, L.;Shepherd, D.; Soldan, P.;Lee, E.; Wright, T. Phys. Chem. Chem. Phys. 2004, 6, 4233]. Spectroscopic constants for the ground and excited states of RbAr are derived and compared with the available theoretical and experimental results. Furthermore, we have predicted the X 2 6 + ---A 2 1/2 , X 2 6 + ---A 3/2 and X 2 6 + --B 2 6 1/2 + absorption spectra.

Rubidium spectroscopy at high-pressure buffer gas conditions: detailed balance in the optical interaction of an absorber coupled to a reservoir

“…Potential curves of the diatomic rubidium molecule as a function of the internuclear distance for the lowest electronic levels are shown in figure 1(c), with the asymptotic atomic energy level configuration being displayed on the right hand side. Pair interaction potential curves for the atomic Rb-Ar system that are relevant for our study of Rb atomic lines in Ar environment have been calculated [21]. We are not aware of any similar calculation for the Rb 2 -Ar interaction that would be relevant for our work on Rb 2 spectra.…”

Laser cooling of dense atomic gases by collisional redistribution of radiation and spectroscopy of molecular dimers in a dense buffer gas environment

“…Since this three body problem cannot be solved analytically and has not been investigated yet, there are no known potential lines for this problem as for the atomic case (Rb+Ar). 15 In order to investigate the presence of alkali dimers in dense buffer gas, absorption spectroscopy is performed using an ordinary halogen lamp. The light passes through the cell and is subsequently collected by an optical spectrum analyzer.…”

“…Cooling principle for the case of rubidium atoms subject to high pressure argon gas using calculated potential curves. 15 When an argon buffer gas atom collides with a rubidium atom, absorption of red detuned incident radiation becomes possible. The alkali atoms populate excited states and subsequent fluorescence originates close to the unperturbed resonances, thus having shorter wavelength than the incident laser beam and effectively cooling the sample.…”

Isotope study of the nonlinear pressure shifts of $^{85}$Rb and $^{87}$Rb hyperfine resonances in Ar, Kr, and Xe buffer gases

“…der Waals molecules, [15][16][17][18][19][20][21] which have long been known to be important to atomic devices. [22][23][24] Three-body "sticking" collisions (or teratomic recombination), [25][26][27][28][29][30] such as Rb + 2Xe −→ RbXe + Xe, produce the majority of these short-lived molecules, which remain until later dissociating, primarily in two-body atom-molecule collisions (or time-reversed teratomic recombination).…”