Theoretical diagnostics of ultraviolet and infrared spectral emission from boron-like ions.

Details Theoretical diagnostics of ultraviolet and infrared spectral emission from boron-like ions. Theoretical diagnostics of ultraviolet and infrared spectral emission from boron-like ions.

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26as..112..151p&link_type=abstract

Astronomy and Astrophysics Supplement, v.112, p.151

Astronomy and Astrophysics

Astrophysics

13

Ultraviolet: General, Infrared: General, Atomic Processes, Galaxies: Nuclei, Hii Regions

Scientific paper

Theoretical analysis of line intensities from transitions in boron-like ions, C II, N III, O IV, Ne VI, Mg VIII, Al IX, Si X, and S XII, is presented using new atomic data. Possible temperature and density diagonostics are investigated. Certain line ratios of UV lines are shown to be especially sensitive to either the electron temperature or the electron density and should be useful in the determination of these parameters; selected examples are given. Highly charged B-like ions should serve as effective coolants through electron impact excitation of the ground state fine-structure transition ^2^P^0^_1/2_-^2^P^0^_3/2_ observed in the infrared. The IR line is expected to be strong in a variety of sources such as H II regions, AGN's and QSO's. Cooling rates for the IR transitions are tabulated as functions of temperature and density and applications to the abundance determination of elements are discussed. Laser action due to population inversion in the metastable ^2^P^0^_3/2_ level in B-like C, N, O, Ne and Mg ions is also discussed.

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