ISSN:
1434-601X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The hyperfine structure (hfs) interaction between the metastable 23 S 1 and 21 S 0 states in6, 7Li+ causes very small equal and opposite energy level shifts,δ, in the two levels having the same total angular momentum quantum numberF=I. This amounts to 12ppm with respect to the total hfs splitting of 30 GHz for the7Li+ 23S1 state and has been measured for the first time directly for the case of a core-free electronic system by combined laser-microwave spectroscopy. A new calculation ofδ with accurate integral-transform 21 S 0 and 23S1 wave functions is reported. Configuration interactions and electron exchange and correlation effects, which differ for parallel (3 S 1) and antiparallel (1 S 0) spins, are treated in detail in order to obtain very good agreement between measured and theoretical values for this tiny perturbation. A complete understanding ofδ is indispensable for extracting fundamental constants from two-electron spectroscopic data.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01417220
