Effective collision strengths for transitions in the 4pk (k = 2-4) ground configurations of Kr III, Kr IV and Kr V
Institut für Astronomie und Astrophysik der Universität München, Scheinerstr. 1, D-81679 München, Germany
Send offprint request to: T. Schöning
Accepted: 19 July 1996
Effective electron excitation collision strengths for fine-structure forbidden transitions within the 4pk () 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 . 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 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 nebulae.
Key words: atomic data / plasmas / planetary nebulae: NGC 7027
© European Southern Observatory (ESO), 1997