On the Spectrum of a Gaseous Nebula of Pure Hydrogen, I

Details On the Spectrum of a Gaseous Nebula of Pure Hydrogen, I On the Spectrum of a Gaseous Nebula of Pure Hydrogen, I

Nov 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968ap%26ss...2..285g&link_type=abstract

Astrophysics and Space Science, Volume 2, Issue 3, pp.285-301

Astronomy and Astrophysics

Astrophysics

17

Scientific paper

The emissivity for the two photons decay from the metastable level 2s has been computed in the case of a gaseous nebula of pure hydrogen, with both radiative and collisional excitation of the states. The populations of 2s and 2p levels are deduced from the condition of equilibrium with other levels. Electron temperatures between 104 and 4×104K and electron densities between 104 and 106 cm-3 have been investigated. For the optically thin case Ly α intensity has also been computed. In the case of collisional excitation a much greater efficiency for the two photons process is found, which profoundly affects the appearance of the continuous spectrum.

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