Measured electron-impact ionization of Be-like ions: B(+), C(2+), N(3+), and O(4+)

Details Measured electron-impact ionization of Be-like ions: B(+), C(2+), N(3+), and O(4+) Measured electron-impact ionization of Be-like ions: B(+), C(2+), N(3+), and O(4+)

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983phrva..28...91f&link_type=abstract

Physical Review A - General Physics, 3rd series (ISSN 0556-2791), vol. 28, July 1983, p. 91-98.

Physics

General Physics

30

Electron Impact, Ground State, Ion Beams, Ionization Cross Sections, Positive Ions, Boron, Carbon, Metastable State, Nitrogen Ions, Oxygen Ions

Scientific paper

Electron-impact-ionization cross sections have been measured from threshold to about 20 times threshold for Be-like ions B(+), C(2+), N(3+), and O(4+) with the use of the crossed-beams technique. The ion beams consist of mixtures of ions in the 2s2 1S ground state and the 2s 2p (3)P 0, l, 2 metastable states. For B(+) and C(2+) the metastable fractions could be changed, allowing estimates of ground-state cross section, while for N(3+) and O(4+) the metastables appear to dominate the beams and the fraction could not be changed. The measured cross sections are compared with a variety of predictions. Distorted-wave calculations compared most favorably, but discrepancies up to 40 percent are found. The metastable-state-ground-state mixture complicates the comparisons for these beam experiments and is probably an issue for all environments where light (Z less than or equal to 15) Be-like ions occur.

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