Bowen Fluorescence, Stark Broadening, and Transition Probabilities in the O III Spectrum

Details Bowen Fluorescence, Stark Broadening, and Transition Probabilities in the O III Spectrum Bowen Fluorescence, Stark Broadening, and Transition Probabilities in the O III Spectrum

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apjs..151..399d&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 151, Issue 2, pp. 399-402.

Astronomy and Astrophysics

Astronomy

3

Atomic Data, Line: Profiles, Methods: Laboratory, Plasmas

Scientific paper

The intensity ratios of the 344.405, 342.863, and 343.057 nm spectral lines of doubly ionized oxygen (O III), which originate from the 2p3d3Po2,1 levels, have been investigated in optically thin laboratory plasmas in pure oxygen and helium-oxygen mixture at 42,000 and 47,000 K electron temperatures and at electron densities in the range 1022-1023 m-3. Two of them (344.405 and 342.863 nm) belong to the primary cascade in the astrophysically important Bowen fluorescence mechanism. On the basis of the I(344.405 nm)/I(342.863 nm), I(344.405 nm)/I(343.057 nm), and I(343.057 nm)/I(322.863 nm) O III line intensity ratios, in pure oxygen and helium-oxygen plasmas, we have found that the 343.057 nm O III spectral line also shows fluorescence tendency caused by the Bowen mechanism not evident up to now. The transition probability values (Einstein's A-values) of these transitions are obtained by means of the relative line intensity ratio (RLIR) method using, for the first time, the O III spectral lines in emission spectra. We have found that our experimental transition probabilities agree well with calculated A data based on the multiconfiguration Hartree-Fock approximation (MCHF) including the Breit-Pauli potential. Besides, the A-values of the 342.736 and 344.036 nm lines, belonging to the forbidden 3s-4d O III transitions, are also obtained. They are the first measured data. Stark broadening parameters [line width (W) and shift (d)] of the mentioned O III lines have also been measured. They are the first published data.

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