Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...411..637d&link_type=abstract
Astronomy and Astrophysics, v.411, p.637-640 (2003)
Astronomy and Astrophysics
Astrophysics
Plasmas, Atomic Data
Scientific paper
The dependence of the radiation intensity from the 2p3d 3P{o}2,1,0 doubly ionized oxygen (O Iii) levels on the He/O density ratio has been investigated in optically thin laboratory plasmas. A clear contribution of the astrophysically important Bowen mechanism to the most intensive 313.279 nm O Iii line radiation has been found in the primary O Iii Bowen cascade. We have found that in plasmas with electron temperatures of about 50 000 K and electron densities higher than 1022 m-3, the 312.163 nm O Iii spectral line also shows a fluorescence tendency caused by the Bowen mechanism. On the basis of the established dependence of the fluorescence efficiency on the He/O density ratio we recommend the I(313.279 nm)/I(311.567 nm) and I(312.163 nm)/I(311.567 nm) O Iii line intensity ratios as a measure of the presence of the helium/oxygen density ratio in astrophysical plasmas. The line intensity ratio related to the 344.405 nm and 342.863 nm O Iii lines (which also belong to the primary cascade in the Bowen fluorescence mechanism and originate in the same energy level) has also been monitored in pure oxygen and helium-oxygen plasmas. We have found a good agreement with the results of previous astrophysical observations and recently published theoretical predictions. We have also found that the I(344.405 nm)/I(342.863 nm) line intensity ratio does not depends on the helium presence in plasmas and thus, it represents a convenient value in plasma spectroscopy.
Bukvic Srdan
Djenize Stevan
Sreckovic A.
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