The process of energy transfer between excited sodium atom
Jerzy Krasinski, T. Stacewicz, and C. R. Stroud, Jr.
Opt. Comm. 33, 158 (1980).
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Two experiments were carried out to test a process proposed by Allegrini et
al. (1977) as a viable explanation of the fluorescence from high lying
levels which is observed when sodium vapor is illuminated by resonance
radiation. In the first experiment a cell with sodium vapor was
illuminated by a CW dye laser tuned to the 3S to 3P transition, and the
linewidth and lineshape of the fluorescence from the 3D to 3P transition
were measured. In the second experiment the cell was illuminated by two
pulsed lasers, one tuned to the 3S to 3P resonance and the second well off
resonance with this transition. The photoionization current was measured,
as was the fluorescence intensity from the 6S to 3P and 5D to 3P
transitions. The authors conclude that the Allegrini process does not
significantly contribute to the populations in the 5D, 6S and 3D states.
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