Volume 98, Number 2, April 2012
|Number of page(s)||4|
|Section||Atomic, Molecular and Optical Physics|
|Published online||30 April 2012|
Theoretical aids in screening candidates for atomic clocks: Illustration for Yb II
Indian Institute of Astrophysics - Bangalore-560034, India
2 The James Franck Institute, University of Chicago - Chicago, Il 60637, USA
3 Department of Chemistry, Bengal Engineering and Science University - Shibpur, Howrah 711103, India
4 Department of Physics, Maulana Azad College - 8 Rafi Ahmed Kidwai Road, Kolkata-700013, India
Accepted: 27 March 2012
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 2Fo excited states of the Yb II ion by computing the ionization potentials (IP) for the 2S1/2 and 2Fo states of Yb I and the , 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 2Fo7/2 and 2Fo5/2 states, respectively. In addition, computations for the lifetimes (τ) of its [Xe]4f146p(2Po) 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 2Fo states of Yb II, and the results demonstrate the suitability of these methods to aid in screening other candidates for atomic clocks.
PACS: 32.10.Hq – Ionization potentials, electron affinities / 32.70.Cs – Oscillator strengths, lifetimes, transition moments
© EPLA, 2012
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