Absorption spectroscopy of the rubidium dimer in an overheated vapor: An accurate check of molecular structure and dynamics
- Institute of Physics, Bijenicka 46, 10000 Zagreb (Croatia)
- Laboratoire Aime Cotton, CNRS, Campus d'Orsay, 91405 Orsay Cedex (France)
Experimental studies of the absorption spectrum of the Rb{sub 2} dimer are performed in the 600-1100 nm wavelength range for temperatures between 615 and 745 K. The reduced absorption coefficient is measured by spatially resolved white light absorption in overheated rubidium vapor with a radial temperature gradient, which enables simultaneous measurements at different temperatures. Semiclassical and quantum spectral simulations are obtained by taking into account all possible transitions involving the potential curves stemming from the 5 {sup 2}S+5 {sup 2}S and 5 {sup 2}S+5 {sup 2}P asymptotes. The most accurate experimental potential curves are used where available, and newly calculated potential curves and transition dipole moments otherwise. The overall consistency of the theoretical model with the experimental interpretation is obtained only if the radial dependence of both the calculated transition dipole moments and the spin-orbit coupling is taken into account. This highlights the low-resolution absorption spectroscopy as a valuable tool for checking the accuracy of molecular electronic structure calculations.
- OSTI ID:
- 20982309
- Journal Information:
- Physical Review. A, Vol. 75, Issue 3; Other Information: DOI: 10.1103/PhysRevA.75.032512; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION
ABSORPTION SPECTRA
ABSORPTION SPECTROSCOPY
DIMERS
DIPOLE MOMENTS
ELECTRONIC STRUCTURE
INFRARED SPECTRA
MOLECULAR STRUCTURE
POTENTIALS
RUBIDIUM
SEMICLASSICAL APPROXIMATION
SIMULATION
SURFACES
TEMPERATURE GRADIENTS
TEMPERATURE RANGE 0400-1000 K
VAPORS
WAVELENGTHS