Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..122..277s&link_type=abstract
A & A Supplement series, Vol. 122, April II 1997, 277-283.
Astronomy and Astrophysics
Astronomy
16
Atomic Data, Plasmas, Planetary Nebulae: Ngc 7027
Scientific paper
Effective electron excitation collision strengths for fine-structure forbidden transitions within the 4p$^k$ ($k=2-4$) ground configurations of Kr iii Kr iv and Kr v have been calculated using the Breit-Pauli R-matrix technique and are tabulated in the range 2,000-50,000 K. The model for the system target + electron is based on a 6- (Kr iii), 7- (Kr iv) and 8-state (Kr v) close-coupling representation. The comparison with the results of the semi-relativistic\break R-matrix method reveals the importance of full intermediate coupling especially at low electron temperatures. Our data will enable detailed quantitative analyses of collisionally excited krypton lines in the spectra of gaseous\break nebulae.
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