The reliability of H(-) free-free absorption coefficients

Details The reliability of H(-) free-free absorption coefficients The reliability of H(-) free-free absorption coefficients

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..890j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 3, p. 890-898

Astronomy and Astrophysics

Astronomy

9

Absorption Spectra, Absorption Spectroscopy, Absorptivity, Anions, Astronomical Spectroscopy, Hydrogen Ions, Stellar Spectra, Infrared Astronomy, Infrared Spectra, Standard Deviation, Visible Spectrum

Scientific paper

A quantitative assessment is made of the reliability of current estimates of free-free absorption coefficients of the negative hydrogen ion. Results by sophisticated versions of the close coupling, polarised orbital and variational methods are shown to have converged. Analytic approximations for the evaluation of matrix elements are investigated and coefficients corrected by an empirical procedure shown to fit numerical results to a standard deviation of 1% for wavelengths greater than 0.5 microns.

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