Nonlinear Zeeman-shifts

Measurements of the Hanle effect and level crossings at magnetic fields B 0 showed for higher intensities of the excitation laser nonlinear Zeeman shifts [840]. 

Fig. 7.6 Hanle-effect and level crossings at S 0 in the S Ps/i-state of the Rb-isotope. The insert shows the nonlinear Zeeman-shifts...

The determination of the experimental splitting of the 1 /8 1 round state for the B and Ga acceptors from the attributions of the high-resolution Zeeman spectra gives an ordering, in agreement with those calculated by Broeckx [22], but it shows that the 1/2 sublevels shift linearly with field with a positive gi/2 factor whereas the 3/2 sublevels show nonlinear shifts and splitting,... 

To analyze the recorded spectra, the spectrometer needs to be calibrated. The three main calibration parameters are the velocity scale, the center point of the spectrum and the nonlinearity of the velocity/time profile of the oscillation compared to a standard reference. The calibration is performed using a spectrum recorded from an a-iron foil at room temperature using the well defined line positions of the sextet from a-iron, which occur at 5.312mms , 3.076mms , and 0.840mms The center of this a-iron spectrum at room temperature is taken as the reference point (0.0 nun s ) for isomer shift values of sample spectra. The typical Mossbauer spectrum of the 14.4 keV transition of Fe in natural iron (Fig. 4.10) represents a simple example of pure nuclear Zeeman effect. Because of the cubic symmetry of the iron lattice, there is no quadrupole shift of the nuclear energy levels. The relative intensities of the six magnetic dipole transitions are... 

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