Relativistic corrections to the hyperfine splitting are calculated for the triplet 2 3 S 1 state of the helium isotope He 3. The electron-electron correlations are fully incorporated. Due to the unknown nuclear structure contribution a comparison with the experimental result is performed via He 3+ hyperfine splitting. A significant discrepancy with the experiment arises and a possible explanati...

This paper presents an explanation based on torsionally mediated proton-spin-overall-rotation interaction for the observation of doublet hyperfine splittings in some Lamb-dip sub-millimeter-wave transitions between ground-state torsion-rotation states of E symmetry in methanol. These unexpected doublet splittings, some as large as 70 kHz, were observed for rotational quantum numbers in the rang...

High-precision measurements of the ground-state hyperfine structure of heavy highly charged ions [1-4] and the g factor of H-like carbon [5] and oxygen [6] have triggered a great interest to related theoretical calculations. In particular, the 2002 CODATA value for the electron mass is derived mainly from the experimental and theoretical g factor values for H-like carbon and oxygen and it is 4 ...

The IH hyperfine coupling constants of free radicals and ions have been successfully studied by our newly modified s-p· separation type INDO-MO method->, and the most of our calculated coupling constants are significantly better than the corresponding results of the conventional INDO-MO method."" The nuclear hyperfine coupling constant is assumed to be directly proportional to the 2s spin densi...

A universal description of the hyperfine splittings (HFS) in bottomonium and the Bq (q 1⁄4 n, s, c) mesons is obtained with a universal strong coupling constant sð Þ 1⁄4 0:310 in a spin-spin potential. Other characteristics are calculated within the field correlator method, taking the freezing value of the strong coupling independent of nf. The HFS MðB Þ MðBÞ 1⁄4 45:5ð1Þ MeV, MðB sÞ MðBsÞ 1⁄4 4...

The rotational spectrum of AsH(2) in its ground &Xtilde;(2)B(1) electronic state has been recorded using a far-infrared laser magnetic resonance spectrometer. The AsH(2) radical was produced inside the spectrometer cavity by the reaction of arsine (AsH(3)) with fluorine atoms. Hyperfine splittings from both (75)As and (1)H nuclei were observed, and analysis of the spectra has yielded accurate v...