Quasi-classical treatment of hydrogen radio recombination lines in H II nebulae

Details Quasi-classical treatment of hydrogen radio recombination lines in H II nebulae Quasi-classical treatment of hydrogen radio recombination lines in H II nebulae

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977azh....54..301s&link_type=abstract

Astronomicheskii Zhurnal, vol. 54, Mar.-Apr. 1977, p. 301-305. In Russian.

Astronomy and Astrophysics

Astronomy

1

H Lines, Hydrogen Clouds, Nebulae, Radiation Absorption, Spectral Line Width, Stark Effect, Doppler Effect, Fourier Series, Hydrogen Atoms, Optical Thickness

Scientific paper

In radiative transitions between very high levels (n of the order of 100, delta n of the order of unity), the hydrogen atom should behave as a classical system. In this paper, the influence of the classical properties of the atom on the magnitude and sign of the line absorption coefficient is analyzed. It is shown that if n is high enough, stimulated emission in lines begins to prevail over line absorption, and the laser effect arises. This phenomenon can be used to explain discrepancies between the theory of Stark broadening and observations that give abnormally narrow lines.

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