Oscillator strengths for Fe II transitions at 224.918 and 226.008 nanometers

Details Oscillator strengths for Fe II transitions at 224.918 and 226.008 nanometers Oscillator strengths for Fe II transitions at 224.918 and 226.008 nanometers

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...435l.157b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 435, no. 2, p. L157-L159

Computer Science

Numerical Analysis

38

Absorption Spectra, Abundance, Interstellar Matter, Iron Compounds, Numerical Analysis, Oscillator Strengths, Ultraviolet Emission, Astronomical Observatories, Branching (Mathematics), Radiative Lifetime, Signal To Noise Ratios, Spectrometers

Scientific paper

We report accurate experimental absorption oscillator strengths (f-values) for transitions out of the ground level of Fe II to the Z4D07/2 and z4F09/2 levels at 224.918 and 226.008 nm (air wavelengths) to be 0.00182(14) and 0.00244(19), respectively. The number in parenthesis is the uncertainty in the last digits. These two lines are important for studying Fe abundances and grain depletions in the interstellar medium. These f-values are determined by combining emission branching fractions with radiative lifetimes. Branching fractions are measured using classical spectroradiometry on an optically thin source. Radiative lifetimes are from the literature.

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