Precision measurement of relative oscillator strengths. IV - Attainment of 0.5 per cent accuracy: Fe I transitions from levels a5 D/0-4/ /0.00-0.12 eV/

Astronomy and Astrophysics – Astronomy

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Astronomical Spectroscopy, Atomic Spectra, Iron, Oscillators, Accuracy, Error Analysis, Furnaces, Line Spectra, Spectral Line Width, Thermodynamic Equilibrium

Scientific paper

It is shown that the apparatus used at Oxford to measure oscillator strengths should be capable of a photometric accuracy of better than 1% when comparing oscillator strengths. Improvements in the apparatus and procedures are described which were made in an attempt to reach this theoretical accuracy. Measures for 60 Fe I transitions from levels a5 D(0-4) are given, including measurements to an accuracy of 0.5% for most of 37 lines previously measured to a relative accuracy of 5%. The results are compared with previous laboratory data.

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