Abstract
We have used the beam-foil technique to measure the mean lives of the upper levels of: (i) the 2s /sup 2/S/sub 1/2/ - 2p /sup 2/P/sup o//sub 1/2,3/2/ resonance transitions (at 255 and 192 A) in lithiumlike Fe XXIV and (ii) the 2s/sup 2/ /sup 1/S/sub 0/ - 2s2p /sup 3/P/sup o//sub 1/ intersystem transition (at 264 A) in berylliumlike Fe XXIII. The measured mean lives are tau (2p /sup 2/P/sup o//sub 1/2/) = 0.55 +- 0.02, tau (2p /sup 2/P/sup o//sub 3/2/) = 0.235 +- 0.01, and tau (2s2p /sup 3/P/sup o//sub 1/) = 13 +- 4 ns. Oscillator strengths derived from the Fe XXIV results are in good agreement with recent relativistic multiconfiguration Hartree-Fock (MCHF) ''length'' gauge calculations; the Fe XXIII result is not in agreement with these MCHF calculations, but appears to be in agreement with recent intermediate coupling calculations.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
