Physics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jqsrt..34..487m&link_type=abstract
Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073), vol. 34, Dec. 1985, p. 487-492. Research supported
Physics
2
Atomic Excitations, Calcium, Continuous Wave Lasers, Oscillator Strengths, Photon-Electron Interaction, Radiative Lifetime, Atomic Beams, Laser Induced Fluorescence, Pulsed Lasers
Scientific paper
The radiative lifetime of the 4s 5s (3S1) level in Ca was measured during two-step excitation of atoms in a beam which traverses a cold-cathode Penning discharge, where, by electron impact, the atoms are excited to the metastable 4s 5p (3P2,1,0) states. Immediately thereafter, the beam is crossed with a pulse-modulated CW dye laser beam to populate the final state selectively. Using a pulse-modulation frequency of 0.5 MHz, a preliminary value of 12.4 + or - 0.5 ns was obtained with a statistical error of 0.4 percent. The wide limits of systematic error reflect an assumed uncertainty in the excitation function and possible distortion in the fluorescence decay requiring further study.
Bhatia Shveta Kundra
Major F. G.
Makdisi Y.
Nasser I. H.
Zaidi Abdellatif
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