We report on the development of a microwave frequency standard based on a lasercooled
171Yb+ ion trap system. The electronics, lasers, and magnetic shields are integrated into a …

We report a high-performance transportable microwave frequency standard scheme based
on sympathetically cooled 113 Cd+ ions using 40 Ca+ as coolant ions. A transportable …

We measured the ground-state hyperfine splitting of trapped^ 113Cd^+ ions to be
15199862855.02799 (27) Hz with a fractional uncertainty of 1.8× 10^− 14. The ions were …

A microwave frequency standard based on laser-cooled Cd113^+ ions has been developed
in recent years, and the short-term frequency instability is measured to be 6.1× 10^− 13/τ. By …

Regarding microwave frequency standards based on trapped ions, we report on the
determination of the hyperfine splittings and the Landé g J factors of Cd+ 111, 113. The …

Roles of electron correlation effects in the determination of attachment energies, magnetic-
dipole hyperfine-structure constants, and electric-dipole (E 1) matrix elements of the low …

A transportable microwave frequency standard based on laser-cooled 113 Cd+ ions is
introduced, and its working principle and potential performance are discussed. Based on the …

The Dick effect is one of the main limits to the frequency stability of a passive frequency
standard, especially for the fountain clock and ion clock operated in pulsed mode which …

We investigate roles of electron correlation effects in the determination of gj factors of the ns
S 1/2 2 (n= 5, 6, 7), np P 1/2, 3/2 2 (n= 5, 6), 5 d D 3/2, 5/2 2, and 4 f F 5/2, 7/2 2 states of the …

We report precise measurement of the hyperfine splitting and calculation of the Zeeman
coefficients of the $^{171} $ Yb $^+ $ ground state. The absolute hyperfine splitting …