Title :
Black-body radiation shifts and theoretical contributions to atomic clock research
Author :
Safronova, Marianna S. ; Jiang, Dansha ; Arora, Bindiya ; Clark, Charles W. ; Kozlov, Mikhail G. ; Safronova, Ulyana I. ; Johnson, Walter R.
Author_Institution :
Dept. of Phys. & Astron., Univ. of Delaware, Newark, DE, USA
Abstract :
A review of theoretical calculations of black-body radiation (BBR) shifts in various systems of interest to atomic clock research is presented. Calculations for monovalent systems, such as Ca+, Sr+, and Rb are carried out using a relativistic all-order single-double method, where all single and double excitations of the Dirac-Fock wave function are included to all orders of perturbation theory. A recently developed method for accurate calculations of BBR shifts in divalent atoms such as Sr is discussed. This approach combines the relativistic all-order method and the configuration interaction method. The evaluation of uncertainties in theoretical values of BBR shifts is discussed in detail.
Keywords :
Dirac-Fock calculations; atomic clocks; blackbody radiation; calcium; configuration interactions; frequency measurement; perturbation theory; positive ions; rubidium; spectral line shift; strontium; wave functions; BBR shift; Ca+; Dirac-Fock wave function; Rb; Sr; Sr+; atomic clock research; black body radiation shift; configuration-interaction method; divalent atoms; double excitations; monovalent systems; perturbation theory; relativistic all order single-double method; single excitations; Atomic clocks; Atomic measurements; Magnetic separation; Microwave frequencies; NIST; Optical polarization; Physics; Standards development; Temperature; Uncertainty; Computer Simulation; Models, Chemical; Radiation Dosage; Radioisotopes; Scattering, Radiation; Time Factors;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2010.1384
