A&A Supplement series, Vol. 122, April II 1997, 277-283

Received June 13, accepted July 19, 1996

Effective collision strengths for transitions in the 4p (k = 2-4) ground configurations of KrIII, KrIV and KrV

T. Schöning

Send offprint request: T. Schöning
Institut für Astronomie und Astrophysik der Universität München, Scheinerstr. 1, D-81679 München, Germany

Abstract:

Effectiveelectronexcitationcollisionstrengths
for fine-structure forbidden transitions within the 4p (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 . 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.

keywords: atomic data -- plasmas -- planetary nebulae: NGC 7027

 
• 1. Introduction
• 2. Calculations
• 3. Results
• 4. Discussion
• 5. Conclusion
• References