Level crossing magnetic

Let us now turn to molecules. In 1966 Zare [399] was the first to treat in detail the problem of applying magnetic level crossing to molecular objects. He used both the classical and quantum mechanical approachs. Three years later he and his collaborators obtained the first experimental results on the Hanle effect with Na2(H1nu) [290], OH(A2 +) [165]. Among the works performed through 1969-1970 one may mention the... 

The iodine molecule has been very thoroughly studied with electric and magnetic level-crossing spectroscopy. The hyperfine structure of the rotational levels affects the profile of the level-crossing curves [849]. A computer fit to the non-Lorentzian superposition of all Hanle curves from the different hfs levels allows simultaneous determination of the Landd factor g and the lifetime t [850]. Because of different predissociation rates the effective lifetimes of different hfs levels differ considerably. 

Gas Phase. The isotropic or Fermi contact hyperfine (hf) coupling constant Ajgo and the anisotropic or dipole hf tensor elements Agg, A b, and A c of NH2 in the X Bi(0,0,0) and A Ai(0,V2,0) states are compiled in Table 9. The experimentally determined constants were derived from microwave optical double resonance (MODR), microwave absorption (MWA), laser magnetic resonance (LMR), infrared optical double resonance (lODR), optical optical double resonance (OODR), saturation, and magnetic level-crossing spectra. 

A significant difference between the Fermi contact terms in the (0,9,0) and (0,10,0) levels of the A Ai state, obtained from saturation spectra [1] and magnetic level-crossing spectra [2, 3], could not be confirmed by the MODR study [4]. 

Fig. 3. On-dot energy levels for spin-up and spin-down electron states as a function of the position of the dot. Level crossing in the middle of the device is removed by an external magnetic field.

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