Abstract Hyperfine structures of highly charged ions (HCIs) are favourable spectroscopic targets for exploring fundamental physics along with nuclear properties. Recent proposals HCI atomic clocks highlight their importance, especially many-electron HCIs, and they have been theoretically investigated by refining atomic-structure calculations. However, developments in hyperfine spectroscopy HCIs...

The one-loop self-energy correction to the hyperfine structure splitting of the 1s and 2s states of hydrogenlike ions is calculated both for the point and finite nucleus. The results of the calculation are combined with other corrections to find the ground state hyperfine splitting in lithiumlike 209 Bi 80+ and 165 Ho 64+. The recent experimental investigation of the ground-state hyperfine spli...

The one-loop self-energy correction to the hyperfine structure splitting of the 1s and 2s states of hydrogenlike ions is calculated both for the point and finite nucleus. The results of the calculation are combined with other corrections to find the ground state hyperfine splitting in lithiumlike 209 Bi 80+ and 165 Ho 64+. The recent experimental investigation of the ground-state hyperfine spli...

The rotational spectra of DCOand its two isotopomers DCO + and DCO + , produced in a negative glow discharge cell, have been recorded in the 137–792 GHz region, which includes lines from J = 2 ← 1 up to J = 11 ← 10. The determined rotational and centrifugal distortion constants allow to predict the DCOrotational spectrum up to 1000 GHz with an accuracy of 1 part in 10 or better. This is importa...