Singlet and triplet potentials of the ground-state atom pair Rb + Cs studied by Fourier-transform spectroscopy
- Laser Center, Department of Physics, University of Latvia, 19 Rainis boulevard, Riga LV-1586 (Latvia)
A comprehensive study of the X {sup 1}{Sigma}{sup +} and a {sup 3}{Sigma}{sup +} electronic states of the Rb and Cs atom pair in RbCs is presented. Abundant spectroscopic data for the {sup 85}Rb{sup 133}Cs and {sup 87}Rb{sup 133}Cs isotopologues were obtained from Fourier-transform spectra of laser-induced fluorescence (LIF) from the B {sup 1}{Pi} and (4){sup 1}{Sigma}{sup +} states to the a {sup 3}{Sigma}{sup +} (4549 transitions) and X {sup 1}{Sigma}{sup +} (15 709 transitions) states. The X {sup 1}{Sigma}{sup +} state data were complemented by about 15 500 transitions obtained by Fellows et al.[J. Mol. Spectrosc. 197, 19 (1999)]. LIF progressions to the a {sup 3}{Sigma}{sup +} state range from v{sub a}=0 to 37, reaching an outer turning point at 15.97 A. For the X {sup 1}{Sigma}{sup +} state, by analyzing LIF from the shelflike (4){sup 1}{Sigma}{sup +}, the data are extended from v{sub x}=119 as observed in the above-cited paper to v{sub x}=129, extending the outer turning point from 10.7 to 17.55 A. From these data, potential energy curves were constructed simultaneously for both hyperfine coupled states X {sup 1}{Sigma}{sup +} and a {sup 3}{Sigma}{sup +} in a coupled-channels fitting routine. This allowed us to accurately model the potential close to the Rb(5s) + Cs(6s) atom-pair asymptote, which is required to simulate cold collision processes and to analyze the Feshbach resonances observed for {sup 87}Rb{sup 133}Cs by Pilch et al.[Phys. Rev. A 79, 042718 (2009)]. Dissociation energies were determined for the X {sup 1}{Sigma}{sup +} state as D{sub e}=3836.373(40) cm{sup -1} and for the a {sup 3}{Sigma}{sup +} state as D{sub e}=259.341(30) cm{sup -1}.
- OSTI ID:
- 21546768
- Journal Information:
- Physical Review. A, Vol. 83, Issue 5; Other Information: DOI: 10.1103/PhysRevA.83.052519; (c) 2011 American Institute of Physics; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fourier-transform spectroscopy of (4){sup 1}Σ{sup +} → A {sup 1}Σ{sup +} − b {sup 3}Π, A {sup 1}Σ{sup +} − b {sup 3}Π → X{sup 1}Σ{sup +}, and (1){sup 3} Δ{sub 1} → b{sup 3}Π{sub 0±} transitions in KCs and deperturbation treatment of A {sup 1}Σ{sup +} and b {sup 3}Π states
Spectroscopic data, spin-orbit functions, and revised analysis of strong perturbative interactions for the A {sup 1{Sigma}+} and b {sup 3{Pi}} states of RbCs
Related Subjects
ATOMS
CESIUM
COUPLED CHANNEL THEORY
DISSOCIATION ENERGY
FLUORESCENCE
FOURIER TRANSFORM SPECTROMETERS
GROUND STATES
POTENTIAL ENERGY
POTENTIALS
RESONANCE
RUBIDIUM
SPECTROSCOPY
TRIPLETS
ALKALI METALS
ELEMENTS
EMISSION
ENERGY
ENERGY LEVELS
LUMINESCENCE
MEASURING INSTRUMENTS
METALS
MULTIPLETS
PHOTON EMISSION
SPECTROMETERS