Oscillator strengths of the Si II 181 nanometer resonance multiplet

Details Oscillator strengths of the Si II 181 nanometer resonance multiplet Oscillator strengths of the Si II 181 nanometer resonance multiplet

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414l.137b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 414, no. 2, p. L137-L140.

Astronomy and Astrophysics

Astrophysics

59

Interstellar Matter, Oscillator Strengths, Resonance Lines, Silicon, Astronomical Spectroscopy, Laser Induced Fluorescence, Optical Thickness, Radiative Lifetime

Scientific paper

We report Si II experimental log (gf)-values of -2.38(4) for the 180.801 nm line, of -2.18(4) for the 181.693 nm line, and of -3.29(5) for the 181.745 nm line, where the number in parentheses is the uncertainty in the last digit. The overall uncertainties (about 10 percent) include the 1 sigma random uncertainty (about 6 percent) and an estimate of the systematic uncertainty. The oscillator strengths are determined by combining branching fractions and radiative lifetimes. The branching fractions are measured using standard spectroradiometry on an optically thin source; the radiative lifetimes are measured using time-resolved laser-induced fluorescence.

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