Stark broadening theory of solar Rydberg lines in the far-infrared spectrum

Details Stark broadening theory of solar Rydberg lines in the far-infrared spectrum Stark broadening theory of solar Rydberg lines in the far-infrared spectrum

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...277..623v&link_type=abstract

Astronomy and Astrophysics, Vol. 277, p. 623 (1993)

Astronomy and Astrophysics

Astrophysics

7

Atomic Data - Atomic Processes - Sun: Atmosphere

Scientific paper

Line broadening theory is revisited to obtain simple formulae, in the specific case of isolated lines, resulting from transitions between nearly degenerate states of atomic magnesium. Both the widths and shifts, due to collisions with electrons and positive ions, are obtained without any elaborate calculations for all the Rydberg lines (n′, l′) → (n,l′+1), (5≤n′≤ 1O n′≤n<11, l>3), listed by Jefferies (1991). Validity conditions of the formulae are given for all the transitions under study.
It is shown that inelastic weak collisions usually dominate the widths, and that adiabatic ion collisions always dominate the shifts and thus determine their signs. The shifts appear as good diagnostics; e.g. for the peculiar case of the 6h-7i line near 12 μm, good agreement with observations is obtained for electron and ion densities close to those in the line forming region.

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