Oscillator Strengths for Ultraviolet Transitions in P II and Cu II for Interstellar Studies

Details Oscillator Strengths for Ultraviolet Transitions in P II and Cu II for Interstellar Studies Oscillator Strengths for Ultraviolet Transitions in P II and Cu II for Interstellar Studies

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.0306b&link_type=abstract

American Astronomical Society, AAS Meeting #212, #3.06; Bulletin of the American Astronomical Society, Vol. 40, p.184

Astronomy and Astrophysics

Astronomy

Scientific paper

Information on the makeup of the solid material in space as well as on the production of elements in our Galaxy and beyond may be gained through analysis of ultraviolet absorption from ions in interstellar clouds. High quality oscillator strengths are needed in order to convert the amount of absorption into an accurate abundance from data acquired with the Hubble Space Telescope and the Far Ultraviolet Spectroscopic Explorer. Lifetimes from our most recent beam-foil experiments for ultraviolet transitions in P II and Cu II are reported. When combined with our measured branching fractions, oscillator strengths for all transitions within the P II multiplet (3s23p2 3P-3s23p4s 3Po) at 1154 Å were determined. There was close agreement between our laboratory measurements and theoretical and semi-empirical calculations, suggesting a means for calibrating fast-beam instruments in the far ultraviolet. The Cu II results for the 1358 Å line (3d10 1S-3d9(2D)4p 3D0) provide further evidence for a short lifetime for the upper state of interest.

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