Electron-impact ionization of Be-like CIII, NIV, and OV
2008 (English)In: Astrophysical Journal Supplement Series, ISSN 0067-0049, E-ISSN 1538-4365, Vol. 175, no 2, 543-556 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2008. Vol. 175, no 2, 543-556 p.
atomic data, atomic processes, methods : laboratory
IdentifiersURN: urn:nbn:se:su:diva-58522DOI: 10.1086/525256ISI: 000257759300011OAI: oai:DiVA.org:su-58522DiVA: diva2:420677
authorCount :122011-06-032011-06-032011-06-03Bibliographically approved