Shake-up processes following K-shell photoionization in the Boron isoelectronic sequence

Details Shake-up processes following K-shell photoionization in the Boron isoelectronic sequence Shake-up processes following K-shell photoionization in the Boron isoelectronic sequence

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...334l..26s&link_type=abstract

Astronomy and Astrophysics, v.334, p.L26-L28 (1998)

Physics

Atomic Physics

1

Atomic Physics: K-Photoionization: Shake-Up Process

Scientific paper

The direct and conjugate shake-up cross sections for the 2p -> 3p, 3s and 2s -> 2p, 3s transitions are calculated for CII, NIII, OIV, FV and NeVI in a close-coupling approximation using the R-matrix method. We find that the total shake-up cross section relative to that for single photoionization decreases with increasing Z. The decrease is about a factor 10 when going from BI to NeVI. When the full shake-up regime is reached, i.e. for about twice the 1s threshold energy, the cross section ratio ranges from about 15% for CII to about 3.5% for NeVI, of the single 1s inner-shell photoionization cross section. The 2s -> 3s transition gives the dominant contribution for all ions. The 2p -> 3p and 2s -> 2p excitation contributions are broadly comparable in this energy range, while the 2p -> 3s transition is negligible. Our results suggest that the importance of shake off excitation is significant for low Z ions.

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