Review of plasma broadening of spectral lines from multiply ionized non-hydrogenic atoms

Details Review of plasma broadening of spectral lines from multiply ionized non-hydrogenic atoms Review of plasma broadening of spectral lines from multiply ionized non-hydrogenic atoms

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..467....3g&link_type=abstract

The 14th international conference on spectral line shapes. AIP Conference Proceedings, Volume 467, pp. 3-13 (1999).

Physics

6

Semiclassical Methods, Line And Band Widths, Shapes, And Shifts, Zeeman And Stark Effects

Scientific paper

There has been substantial progress made in our quantitative understanding of the widths, shifts and asymmetries of lines from neutral atoms and low charge-state ions due to (mostly) dipole interactions with plasma electrons and ions, i.e., of Stark broadening proper. Nevertheless, recent measurements and calculations of plasma broadening of higher charge-state ions continue to yield surprising and sometimes contradictory results. Experimentally, both line profile measurements and independent measurements of plasma conditions become increasingly difficult as one proceeds to higher charge-states, i.e., to higher temperatures (and densities). In the calculations, especially of the broadening by electrons, some of the approximations used with good success for atoms and low charge-state ions may be questionable (e.g., the dipole and classical-path approximations). Suitably improved quantum-mechanical calculations give both significant shifts for ion lines due to penetrating monopole interactions, and for certain lines widths smaller by a factor of about 2 than predicted by some semiclassical calculations, because of quantum effects. In some experiments, the problem of distinguishing Doppler broadening from nonthermal motions remains unresolved.

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