Saturated laser-induced fluorescence in a high-pressure metal halide discharge
- 1 March 1990
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 67 (5), 2289-2297
- https://doi.org/10.1063/1.345523
Abstract
Local measurements of the saturated laser-induced fluorescence (LIF) signal from pulsed laser excitation of the 6 3 P1 resonance state of Hg have been obtained in a high-pressure metal halide lamp. Hg atoms were excited at 436 nm (6 3P1 →7 3S1 ) and the laser-induced fluorescence was detected at 546 nm (7 3S1 →63P2 ). The LIF signals were obtained as a function of radial position and the ac phase angle. The LIF signals were corrected for the optical depth of the fluorescence. The LIF measurements were made under saturated conditions to minimize the spatial dependence of the fluorescence quantum efficiency in the discharge. The 6 3P1 density was a maximum at the arc center and monotonically decreased towards the wall. The relative 6 3 P1 profile was broader at the current zero crossing than at the current maximum. The 6 3 P1 density was undermodulated during the ac phase at the arc center compared to predictions based on the Hg 577-nm emission, suggesting a departure from local thermodynamic equilibrium. At a reduced radius of 0.62, the 6 3 P1 density was almost independent of phase angle. Estimates of the 6 3 P2 density were obtained from the optical depth. LIF measurements were also obtained by exciting the 6 3P2 level of Hg at 546 nm and detecting the fluorescence at 436 nm. The spatial and phase angle dependence of the LIF signals from a mercury discharge were very similar to the results from a metal halide lamp.Keywords
This publication has 13 references indexed in Scilit:
- Lifetimes, branching ratios, and absolute transition probabilities in Hg iJournal of the Optical Society of America B, 1989
- Pulsed-laser optogalvanic spectroscopy of sodium and scandium in a high-pressure metal halide dischargeJournal of Applied Physics, 1988
- Pulsed-laser optogalvanic spectroscopy in a high-pressure Hg dischargeJournal of Applied Physics, 1988
- Anomalous saturation curves in laser-induced fluorescenceSpectrochimica Acta Part B: Atomic Spectroscopy, 1985
- Diagnostics of high-pressure arc plasmas from laser-induced fluorescenceJournal of Physics D: Applied Physics, 1981
- Rate equation solution for the temporal behavior of a three-level systemApplied Optics, 1980
- Cross-section and rate formulas for electron-impact ionization, excitation, deexcitation, and total depopulation of excited atomsPhysical Review A, 1980
- Saturation effects in laser induced fluorescence spectroscopyApplied Optics, 1977
- Influence of non-quenching collisions upon saturated resonance fluorescenceSpectrochimica Acta Part B: Atomic Spectroscopy, 1972
- Theory of laser saturated atomic resonance fluorescenceSpectrochimica Acta Part B: Atomic Spectroscopy, 1972