Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.177..551o&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 177, Dec. 1976, p. 551-568. Research supported by the University of Que
Astronomy and Astrophysics
Astrophysics
35
Absorption Cross Sections, Atomic Collisions, Hydrogen Atoms, Spectral Line Width, Stellar Spectra, Atomic Energy Levels, Damping, Electron Transitions, Phase Shift, Quantum Numbers, Solar Spectra, Stellar Atmospheres, Van Der Waals Forces, Wave Functions
Scientific paper
Recent developments in the theory of spectral-line broadening by collisions with neutral hydrogen atoms are reviewed. Special attention is given to Brueckner's (1971) theory in which electron exchange between atoms is neglected, but not the overlap of atomic charge distributions. This theory is extended to transitions of astrophysical interest, and an analytical expression for one of the integrals in the theory is obtained which permits routine calculations of line widths, provided suitable wave functions are available for the excited states of the absorbing atom. Line-broadening cross sections are tabulated for transitions having upper s, p, d, and f states, respectively, and are found to be somewhat smaller than those determined by Brueckner. The theoretical damping constants are compared with empirical solar damping constants, agreement between the values is evaluated, and deficiencies of Brueckner's theory are noted.
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