Noble-gas broadening rates for the 6[ital s][sup 2][ital S][sub 0][r arrow]6[ital s]6[ital p] [sup 1,3][ital P][sub 1] resonance and intercombination lines of barium
- Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, Pennsylvania 18015 (United States)
The collisional-broadening and -shift rate coefficients ([ital k][sub br] and [ital k][sub shift]), for both helium and argon buffer gases, have been measured in the impact limit for the 6[ital s][sup 2] [sup 1][ital S][sub 0][r arrow]6[ital s]6[ital p] [sup 3][ital P][sub 1] intercombination transition of barium. Detailed absorption line shapes were measured at three different ground-state number densities by monitoring the transmitted intensity of a weak cw probe laser as it was scanned over the transition. A single, density-independent line shape was then constructed and fit to a sum of Voigt functions (to account for hyperfine structure and isotope shifts) in order to determine the broadening and shift rates. By repeating the process for several buffer-gas pressures, [ital k][sub br] and [ital k][sub shift] were determined from least-squares straight-line fits to the broadening and shift rates versus buffer-gas number density. Absolute normalization of the line-shape data was used to provide accurate ground-state column densities. Column-density information was then combined with measurements of white-light-absorption equivalent widths for the 6[ital s][sup 2] [sup 1][ital S][sub 0][r arrow]6[ital s]6[ital p] [sup 1][ital P][sub 1] resonance transition to yield broadening rates for that transition. These values for the resonance line lie between previous literature values, which are widely discrepant. Finally we measured the absolute metastable 6[ital s]5[ital d] [sup 3][ital D][sub 2] column density under conditions of optical pumping through the [sup 3][ital P][sub 1] level, and determined that, in steady state, even with a weak cw pump laser, [similar to]20% of all barium atoms in the vapor could be found in the [sup 3][ital D][sub 2] level (with approximately 60% spread over the full [sup 3][ital D][sub [ital J]] metastable manifold).
- OSTI ID:
- 6702224
- Journal Information:
- Physical Review A; (United States), Vol. 47:4; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ARGON
LINE BROADENING
BARIUM
ATOM-ATOM COLLISIONS
HELIUM
ENERGY-LEVEL TRANSITIONS
P STATES
RESONANCE SCATTERING
S STATES
ALKALINE EARTH METALS
ATOM COLLISIONS
COLLISIONS
ELEMENTS
ENERGY LEVELS
FLUIDS
GASES
INELASTIC SCATTERING
METALS
NONMETALS
RARE GASES
SCATTERING
664300* - Atomic & Molecular Physics- Collision Phenomena- (1992-)