Effective collision strengths with inclusion of resonance for hyperfine-structure transitions in H- and Li-like ions

Details Effective collision strengths with inclusion of resonance for hyperfine-structure transitions in H- and Li-like ions Effective collision strengths with inclusion of resonance for hyperfine-structure transitions in H- and Li-like ions

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.322..433z&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 322, Issue 3, pp. 433-437.

Astronomy and Astrophysics

Astronomy

2

Atomic Processes, Line: Formation

Scientific paper

Calculations are made of the resonance contribution to electron-impact excitation of H-like 13C and Li-like 23Na, 25Mg, 27Al and 29Si to the upper hyperfine levels that produce millimetre (mm) lines of likely astrophysical interest. The resonance contribution is found to be very important for these Li-like ions, considerably more important than for Li-like 57Fe considered previously. However, resonances are found to be rather unimportant for H-like 13C. The effect of radiative decay on the resonance contribution is found to be insignificant in all of the present calculations.

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