Investigations of Ra$^+$ properties to test possibilities of new optical frequency standards

Details Investigations of Ra$^+$ properties to test possibilities of new optical frequency standards Investigations of Ra$^+$ properties to test possibilities of new optical frequency standards

2007-06-12

arxiv.org/abs/0706.1705v3

Physics

Atomic Physics

Latex files, 5 pages, 1 figure

Scientific paper

10.1103/PhysRevA.76.040504

The present work tests the suitability of the narrow transitions $7s \ ^2S_{1/2} \to 6d ^2D_{3/2}$ and $7s ^2S_{1/2} \to 6d ^2D_{5/2}$ in Ra$^+$ for optical frequency standard studies. Our calculations of the lifetimes of the metastable $6d$ states using the relativistic coupled-cluster theory suggest that they are sufficiently long for Ra$^+$ to be considered as a potential candidate for an atomic clock. This is further corroborated by our studies of the hyperfine interactions, dipole and quadrupole polarizabilities and quadrupole moments of the appropriate states of this system.

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