Hyperline magnetic field

Magnetic tuning of diatomic bound-state and scattering properties relies on the Zee-man effect in the hyperline structure of alkali-metal atoms. The splitting into sublevels of the 5i/2 electronic ground state of such an atom which is exposed to a magnetic field B can be described by the following Hamiltonian comprised of hyperfine and Zeeman interactions [27] ... 

Fig. 6.2 Theoretical Fe Mossbauer relaxation spectra for longitudinal relaxation with the indicated relaxation times and with a hyperline field that can assume the values 55 T. The symmetry direction of the axially symmetric EFG is assumed parallel to the magnetic hyperfine field. (Reprinted with permission from [9] copyright 1966 by the American Physical Society)...

In case of Fe, the resonant absorption of 14.4 keV y-rays emitted by a radioactive Co source is measured. The spectra are determined by the hyperfine interactions (isomer shift, quadrupole splitting, and magnetic hyperline field) of the Mossbauer nucleus caused by the surrounding electron shell. 

A slightly increased linewidth is observed for the Sn spectrum of YbPtSn at 4.2 K (Pottgen et al. 1999a). This is probably due to a small transferred hyperline field resulting from magnetic fluctuations of the jdterbium atoms. 

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