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Globular Lightning (1919)

MCCLELLAND, J. A.

[s.l.] : Nature Publishing Group

Nature 103 (1919), S. 284-284

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] As well-authenticated cases of globular lightning are comparatively rare, the accompanying note by Mr. Gilmore may be of interest to vour readers. Mr. Gilmore is a research student working in this laboratory. He is at present engaged on a research dealing with the electric charge on rain, and ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/103284c0

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Infrared laser-emission study in a resonantly excited sodium vapor (1983)

Müller, W. ; McClelland, J. J. ; Hertel, I. V.

Springer

Applied physics 31 (1983), S. 131-134

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ISSN: 1432-0649

Keywords: 34.50 H ; 42.55 Hq ; 52.50 Jm

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract We report on a study of time dependence of ir laser emission at 3.41 μm in a dense Na vapor that is resonantly excited to the 32 P levels by a flashlamp, pumped dye laser. Energy-pooling collisions (excitation transfer) between excited atoms create a large population inversion among the 52 S 1/2 and 42 P 3/2 states which is destroyed by electron collisions as a result of subsequent plasma formation. The ir laser emission may serve as a new diagnostic tool to follow the time evolution of such media.