Redistribution of radiation in the absence of collisions

Details Redistribution of radiation in the absence of collisions Redistribution of radiation in the absence of collisions

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...288..820l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 288, Jan. 15, 1985, p. 820-823. NBS-NASA-supported research.

Astronomy and Astrophysics

Astrophysics

8

Atmospheric Scattering, Helium, Line Spectra, Radiation Distribution, Radiative Transfer, Stellar Radiation, Depolarization, Dye Lasers, Fluorescence, H Alpha Line, Stellar Atmospheres

Scientific paper

Redistribution and depolarization of near-resonant radiation is studied for the He 2(1P)-3(1D) line (668 nm) and some data for H-alpha (656 nm) are also presented. A Nd:YAG pumped dye laser, with a bandwidth of 0.1/cm and a power density of 100 kW/sq cm, is used in the experiment. The transitions have lower levels with natural line widths that are large compared with their upper-level natural widths, and, under experimental conditions, their collisional widths are also small. The ratio of fluorescence to Rayleigh intensity is measured and the results indicate that while the Rayleigh emission has the same temporal development as the laser pulse (5 ns FWHM), the fluorescent intensity has a decay time determined by the radiative decay lifetime and by collisional quenching. The prediction that redistribution of radiation occurs in the absence of collisions for transitions having significant lower-level radiative widths is confirmed. Depolarization rates by collisions with helium are also inferred from the measurements.

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