Abstract
The results of a new series of precision lifetime measurements on alkali atoms by means of beam–gas–laser spectroscopy are reported and discussed. The lifetimes of the first excited states in lithium, sodium, potassium and rubidium were measured with uncertainties ranging from ±0.14% to ±0.25%. The results are discussed in comparison with other recent experimental and theoretical work. The longstanding discrepancy between ab initio line strength calculations and the measurements of Gaupp et al. [Phys. Rev. A26, 3351 (1982)] for the resonance transitions in lithium and sodium is resolved by the new measurements in favour of the theoretical calculations. Finally the role of the beam divergence in lifetime measurements on fast particle beams is discussed and a method to correct for this effect is presented. The importance of the beam divergence effect is illustrated by additional recent lifetime measurements on helium and on lithium.
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.
