Proton impact excitation of the 1s(2) 2s(2) 2p(2) (3) P fine-structure transitions in carbon-like ions

Astronomy and Astrophysics – Astrophysics

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Sun: Chromosphere, Atomic Data

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We present new cross sections and thermally averaged excitation rate coefficients for proton impact excitation of the 1s(2) 2s(2) 2p(2) (3) P fine-structure transitions for ions in the carbon isoelectronic sequence. These data have been calculated using a close-coupled impact parameter method that incorporates the effects of higher lying levels of the triplet 2s2p(3) configuration. We find that the inclusion of these additional states leads to significant reductions in excitation rates for high-Z ions.

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