Theoretical study of the 4f¹⁴6s ²S_1/2- 4f¹³6s^{2 2}F_7/2 E3 transition in Yb II

E. Biémont and P. Quinet

Phys. Rev. Lett. 81, 3345-3346 (1998)

In view of the current interest of ion trap workers in the lifetime of the 4f¹³6s^{2 2}F_7/2 level in Yb II which may decay by electric octupole (E3) radiation to the ground 4f¹⁴6s ²S_1/2 level, we have used a pseudo relativistic Hartree-Fock method including configuration interaction and core polarization effects to estimate the vlue of the E3 matrix element <4f|r³|6s>. The calculated lifetime , t = 8.4 yr, is in excellent agreement with the recent measurment due to Roberts et al. [Phys. Rev. Lett. 78, 1876 (1997)] (t = 10.1⁺⁷_-4 yr).

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