Hyperfine structure nuclear moments from

I participated as a graduate student in the experimental activities of the group but also given the task to learn about electronic structure calculations. The standard procedure for evaluation of nuclear moments from measured hyperfine structure constants was to obtain a value of r" from the spin-orbit coupling constant, using relativistic correction factors. The formulas as well as the relativistic correction factors were given in the book by Kopfermann... 

As mentioned in section 1.2, the hyperfine structure is much better resolved in EPR than in optical spectra the first example, the spectra of the two Nd isotopes of mass 143 and 145, is shown in fig. 2. Those of odd-neutron isotopes of other trivalent ions of Sm, Dy, Er and Yb followed soon afterwards, together with the odd-proton nuclei of Pr, Tb, Ho and Tm. Calculation of the nuclear moments from the hyperfine structure depended on estimates of the value of these have... 

Prior to about 1955 much of the nuclear information was obtained from application of atomic physics. The nuclear spin, nuclear magnetic and electric moments and changes in mean-squared charge radii are derived from measurement of the atomic hyperfine structure (hfs) and Isotope Shift (IS) and are obtained in a nuclear model independent way. With the development of the tunable dye laser and its use with the online isotope separator this field has been rejuvenated. The scheme of collinear laser/fast-beam spectroscopy [KAU76] promised to be useful for a wide variety of elements, thus UNISOR began in 1980 to develop this type of facility. The present paper describes some of the first results from the UNISOR laser facility. 

The hyperfine-structure from nuclear magnetic moments on the electron spin resonance curve was first interpreted by Owen and Stevens in the case of IrClg-. There is no doubt that this gives a perfect qualitative proof for the delocalization of the partly filled shell. However, it is less clear whether there is a simple equivalence between the ligand nuclear influence and b in eq. (19). The point is that the partly filled shell has to be orthogonal, in a very complicated way, on all the previously filled shells such as Is and 2s of the X atoms. 

Bond lengths and angles, dipole moments (Table 2, Section 4.01.3.2) and 14N nuclear coupling have been determined and the 14N hyperfine structure has been analyzed for several 1,3,4-oxadiazoles (74PMH(6)53). Observed 44N quadrupole coupling constants have been compared with values obtained from microwave spectra (74JCP(6l)l494). 

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