Electron-Impact Ionization of Be-like C III, N IV, and O V

Details Electron-Impact Ionization of Be-like C III, N IV, and O V Electron-Impact Ionization of Be-like C III, N IV, and O V

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apjs..175..543f&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 175, Issue 2, pp. 543-556.

Astronomy and Astrophysics

Astronomy

10

Atomic Data, Atomic Processes, Methods: Laboratory

Scientific paper

We present recent measurements of absolute electron-impact ionization cross sections for Be-like C III, N IV, and O V forming Li-like C IV, N V, and O VI. The measurements were taken using the crossed-beams apparatus at Oak Ridge National Laboratory. A gas cell beam attenuation method was used to independently measure the metastable fractions present in the ion beams. The measured ionization cross sections were compared with calculations using the R-matrix with pseudostates and distorted-wave theoretical methods. Best agreement is found with the R-matrix with pseudostates cross sections results that account for the metastable fractions inferred from the gas attenuation measurements. We present a set of recommended rate coefficients for electron-impact single ionization from the ground state and metastable term of each ion.

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