AAS 206th Meeting, 29 May - 2 June 2005
Session 32 Highlights in Laboratory Astrophysics
Poster, Wednesday, 10:00am-7:00pm, Thursday, 9:20am-2:00pm, June 1, 2005, Ballroom A

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[32.04] Oscillator Strengths for Ultraviolet Transitions in Cl~{\small II} and {\small III}

S.R. Federman, R.M. Schectman, M. Brown, S. Cheng, R.E. Irving (U. Toledo), M.C. Fritts (U. Minnesota), N.D. Gibson (Dennison U.)

Oscillator strengths for transitions in Cl~{\small II} and {\small III} are derived from lifetimes and branching fractions measured with beam-foil techniques. The focus is on the multiplets at 1071 Å\ in Cl~{\small II} and 1011 Å\ in Cl~{\small III} whose lines are seen in spectra of diffuse interstellar clouds and the Io torus acquired with the Far Ultraviolet Spectroscopic Explorer. These data represent the first complete set of experimental f-values for the lines in the multiplets. Our results for Cl~{\small II} \lambda1071 agree very well with the most recent theoretical effort and with Morton's newest recommendations. For Cl~{\small III}, however, our f-values are significantly larger than those given by Morton; instead, they are more consistent with recent large-scale theoretical calculations. Extensive tests provide confirmation that LS coupling rules apply to the transitions for these multiplets.

This work was supported by NASA grant NAG5-11440 to the University of Toledo.

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