Atomic data from the IRON Project. XXIV. Electron excitation of Li-like Fe XXIV between the N = 2 and n' = 2, 3, 4 fine-structure levels

Details Atomic data from the IRON Project. XXIV. Electron excitation of Li-like Fe XXIV between the N = 2 and n' = 2, 3, 4 fine-structure levels Atomic data from the IRON Project. XXIV. Electron excitation of Li-like Fe XXIV between the N = 2 and n' = 2, 3, 4 fine-structure levels

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..126..105b&link_type=abstract

A & A Supplement series, Vol. 126, November II 1997, 105-111.

Astronomy and Astrophysics

Astronomy

18

Li-Like Iron, Electron Collision, Atomic Data

Scientific paper

Collision strengths for electron induced transitions in Li-like Fe xxiv are calculated using a Breit-Pauli R-matrix technique. The target has 15 fine structure states corresponding to n <= 4. Autoionizing resonances are found to affect 18 of the 39 collision strengths, namely those for transitions 2lj to n'l'j' where n' = 2, 3. The present calculation is carried out only for electrons incident on the ground state with energies not exceeding 265 Ry. Beyond this we use the relativistic distorted wave collision strengths of Zhang et al. in order to complete our results. Thermally averaged collision strengths are computed and tabulated as functions of log T for transitions out of the 2s_{1/2}, 2p_{1/2} and 2p_{3/2} states. The temperature range considered is 6.2 <= log T <= 8.0, Fe xxiv having its maximum coronal abundance when log T = 7.2.

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