Experimental phosphorus and sulfur stark widths and systematic broadening trends for third-row ions

Details Experimental phosphorus and sulfur stark widths and systematic broadening trends for third-row ions Experimental phosphorus and sulfur stark widths and systematic broadening trends for third-row ions

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291..219m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 1, 1985, p. 219-225.

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6

Atomic Spectra, Phosphorus, Spectral Line Width, Stark Effect, Sulfur, Electron Orbitals, Plasma Spectra

Scientific paper

Stark broadening parameters for the prominent visible phosphorus and sulfur lines are measured at electron densities of (5-15) x 10 to the 16th/cu cm and T = 10,000-12,500 K in a well-calibrated spectroscopic shock tube. Results for 11 of 12 S II lines and for the two leading visible S I blended multiplets agree within 15-30 percent tolerances with other experiments and with theory. For the P II and for two of the three P I lines, no prior published experimental broadening data are available, but results agree within 15-30 percent tolerances with impact broadening predictions. Systematic broadening trends in the third-row ion sequence Al II, Si II, P II, S II, Cl II, Ar II are examined using experimental data for leading visible 4s-4p transition arrays. Trends can be characterized approximately by an inverse 3.5 to 4.0 power dependence on second ionization potential. Trends can be simulated more quantitatively by a product of simple terms representing mechanisms in the semiempirical line-broadening model.

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