Electron Excitation Cross Sections for the C II Transitions 2s 22p 2P O 2s2p 2 4P, 2D, and 2S

Astronomy and Astrophysics – Astronomy

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Atomic Data, Ultraviolet: General

Scientific paper

Experimental and theoretical excitation cross sections are reported for the transitions 2s22 2P0 2s2p2 4P, 2D, and 2S in C II. The transition wavelengths (energies) are 2324 Å (5.34 eV), 1335 Å (9.29 eV), and 1036 Å (11.97 eV), respectively. Use is made of electron energy-loss and merged beams methods. The energy range covered is from below each threshold (4-11 eV) to 15-24 eV. As in previous work with 0 ii, care was taken to assess and minimize the metastable fraction in the C ii beam, to account for contributions from nearby energy-loss features, and to collect the full angular range of inelastically scattered electrons. A comparison is made for each transition between experiment and new 8-state R-matrix calculations.

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