Electron spin magnetic moment

Electron spin magnetic moment)-(electron spin magnetic moment) dipolar interaction energy ... 

There have been no reports of complexes of " JV-substituted thiosemicarbazones derived from 2-formylpyridine, but 2-acetylpyridine JV-methyl-thiosemicarbazone, 3a, formed [Fe(3a-H)2]C104 and [Fe(3a-H)2]FeCl4 [117]. The nature of these two species was established by partial elemental analyses, molar conductivities, magnetic moments, electronic, infrared, mass and electron spin resonance spectra. A crystal structure of a related selenosemicarbazone complex confirmed the presence of a distorted octahedral iron(III) cation coordinated by two deprotonated anions so that each ligand is essentially planar and the azomethine nitrogens are trans to each other the pyridyl nitrogen and selenium donors are both cis. 

There may be a significant orbital contribution to the magnetic moment the spin-only formula, as the label implies, does not take this into account. The quantitative treatment of orbital contributions - which effectively alters the g-value from the free-electron value of 2.0023 - was one of the earliest and most important tasks of CF theory. The following generalisations can be made on the basis of the experimental results and the theoretical treatment for simplicity, we consider only octahedral and tetrahedral fields. 

Pauli spin vector Dirac spin vector electron spin magnetic moment nuclear spin magnetic moment rotational magnetic moment electric dipole moment Ioldy Wouthuysen operator gradient operator Laplacian... 

We found the contraction of the f-wave functions to an atomic like character. This has an important consequense, because we see the onset of a cooperative effect, the orbital magnetic moment to spin conduction band electrons interaction and other correlations will generate an effective mass for the f-electrons which, in turn, will, by contraction of the f-wave function, enhance the atomic like character and then enhance the full process, hence the process will not be smooth or show linear behaviour the process will tend to present a sudden change of the f-electrons from a band character to an almost atomic like behaviour. This many-body effect is responsible for further scattering between the conduction electrons and the rare earth or actinide f electron states,... 

For heavy elements, all of the above non-relativistic methods become increasingly in error with increasing nuclear charge. Dirac 47) developed a relativistic Hamiltonian that is exact for a one-electron atom. It includes relativistic mass-velocity effects, an effect named after Darwin, and the very important interaction that arises between the magnetic moments of spin and orbital motion of the electron (called spin-orbit interaction). A completely correct form of the relativistic Hamiltonian for a many-electron atom has not yet been found. However, excellent results can be obtained by simply adding an electrostatic interaction potential of the form used in the non-relativistic method. This relativistic Hamiltonian has the form... 

In 1925 it was discovered that the electron spins about an axis and that it has a magnetic moment. The spin and magnetic moment are discussed in Section 5-5. 

Confirmation of CFT comes from a consideration of the magnetic properties of coordination compounds. Molar susceptibilities, derived from measurements on a Guoy balance, can be related to the magnetic moment of the complex. A comparison of this experimentally derived magnetic moment with spin-only moments yields a measure of the number of unpaired electrons in the compound. The results derived from a consideration of magnetic properties are consistent with CFT. 

Karplus M 1959 Contact electron spin coupling of nuclear magnetic moments J. Chem. Phys. 30 11-15... 

---