One of the key systematic effects limiting the performance of state-of-the-art optical clocks is
the blackbody radiation (BBR) shift. Here, we demonstrate unusually low sensitivity of a 1.14 …

The accuracy of state-of-the-art atomic clocks is derived from the insensitivity of narrow
optical atomic resonances to environmental perturbations. Two such resonances in singly …

We identify laser-accessible transitions in group-16-like highly charged ions as candidates
for high-accuracy optical clocks, including S-, Se-, and Te-like systems. For this class of ions …

We investigate the feasibility of precision frequency metrology with large ion crystals. For
clock candidates with a negative differential static polarizability, we show that micromotion …

We demonstrate that several metastable excited states in Hf ii, Hf iv, and W vi ions may be
good clock states since they are sufficiently long-living and are not sensitive to the …

We show that by averaging over transitions to multiple hyperfine levels, quadrupole shifts
and dominant Zeeman effects exactly cancel whenever the nuclear spin, I, is at least as …

A version of the configuration interaction method for atoms with open shells (the
Configuration Interaction with Perturbation Theory—CIPT method, PRA 95, 012503 (2017)) …

Singly ionized lutetium has recently been suggested as a potential clock candidate. Here we
report a joint experimental and theoretical investigation of Lu+. Measurements relevant to …

We employ the equation-of-motion coupled-cluster (EOM-CC) method in the four-component
relativistic theory framework to understand the roles of electron correlation effects in the ab …

The Zeeman structure of eight lines of 130 Te covering the spectral range 640–990 nm was
investigated. LandȨ g J factors for seven levels were determined for the first time …