The Astrophysical Journal Supplement Series

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The Astrophysical Journal Supplement Series Volume 175 Number 2 Create an alert RSS this journal

M. Fogle et al. 2008 ApJS 175 543 doi:10.1086/525256

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

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M. Fogle1, E. M. Bahati1, M. E. Bannister1, C. R. Vane1, S. D. Loch2, M. S. Pindzola2, C. P. Ballance3, R. D. Thomas4, V. Zhaunerchyk4, P. Bryans5, W. Mitthumsiri5 and D. W. Savin5

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Abstract References Cited By
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.

Subject headings

atomic data; atomic processes; methods: laboratory


Dates

Issue 2 (2008 April)

Received 2007 August 13, accepted for publication 2007 November 2



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