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Title: Theoretical aids in screening candidates for atomic clocks: Illustration for Yb II
Authors: Chaudhuri, R. K
Freed, K. F
Chattopadhyay, S
Mahapatra, U. S
Keywords: Coupled-cluster theory;Oscillator-strengths;Transition;Lifetimes;Energy;Ions
Issue Date: Apr-2012
Publisher: IOP Publishing
Citation: Europhysics Letters, Vol. 98, No. 2, 23002
Abstract: Highly accurate electronic-structure calculations for metastable electronic excited states are needed to supplement scant experimental data in screening possible systems for new higher-precision atomic clocks. We test the suitability of relativistic coupled-cluster methods for the low-lying F-2 degrees excited states of the Yb II ion by computing the ionization potentials (IP) for the S-2(1/2) and F-2 degrees states of Yb I and the [Xe]4f(14)6s (S-2(1/2)) -> [Xe]4f(13)6s(2) (F-2 degrees(j)), j = 5/2, 7/2, electric octupole transition amplitudes. The calculations establish a minimum lifetime of six years and of 10(-1) s for the F-2 degrees(7/2) and F-2 degrees(5/2) states, respectively. In addition, computations for the lifetimes (T) of its [Xe]4f(14)6p (P-2 degrees) states are compared with high-precision experimental data as tests of the accuracy of our predictions. To our knowledge, this is the first relativistic ab initio estimate of the lifetime and ionization potential for the F-2 degrees states of Yb II, and the results demonstrate the suitability of these methods to aid in screening other candidates for atomic clocks.
Description: Restricted Access
ISSN: 0295-5075
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Appears in Collections:IIAP Publications

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