Effect of Applied Electric Fields on the Electron Spin Resonance ofFe3+andMn2+inα-Al2O3

1964 ◽  
Vol 135 (2A) ◽  
pp. A396-A401 ◽  
Author(s):  
James J. Krebs
Keyword(s):  
Electron Spin Resonance ◽  
Electric Fields ◽  
Electron Spin ◽  
Spin Resonance

Electron spin resonance of Mn2+ impurities in monticellite

1969 ◽  
Vol 47 (8) ◽  
pp. 839-846 ◽  
Author(s):  
A. G. Danilov ◽  
A. Manoogian
Keyword(s):  
Electron Spin Resonance ◽  
Electric Fields ◽  
Electron Spin ◽  
Microwave Frequency ◽  
Spectral Lines ◽  
Orthorhombic Symmetry ◽  
Principal Axes ◽  
Spin Resonance ◽  
Crystalline Electric Fields ◽  
Crystallographic Axes

The electron spin resonance of Mn2+ impurity ions in natural crystals of monticellite, MgCaSiO4, was studied in the 9.4 GHz and 35 GHz microwave frequency ranges, and at room temperature. Four magnetic complexes of manganese were observed, and these were found to degenerate into two in the (010) crystallographic plane. The magnetic field separations of the spectral lines along the principal axes of the crystalline electric fields were the same for all four complexes. The resonance lines were fitted to a spin Hamiltonian of orthorhombic symmetry, and the following parameters were determined: gz = 1.9961, gy = 1.9905, b20 = −558.5, b22 = −351.7, b40 = −0.5, b42 = −56.0, b44 = −40.3, A = 85.5, B = 85.5. The values of bnm, A, and B are in gauss, and the signs are relative. It was possible to relate the axes of the Mn2+ magnetic complexes to the crystallographic axes. Hence, it was determined that the Mn2+ ions replace Mg2+ ions, which are in centers with inversion symmetry, and not Ca2+ ions, which are in centers containing a reflection plane.

Intensity of allowed and forbidden electron spin resonance lines of Mn2+ in tremolite

1968 ◽  
Vol 46 (9) ◽  
pp. 1029-1033 ◽  
Author(s):  
A. Manoogian
Keyword(s):  
Electron Spin Resonance ◽  
Electric Fields ◽  
Electron Spin ◽  
Theoretical Calculations ◽  
Microwave Frequency ◽  
Orthorhombic Symmetry ◽  
Crystalline Electric Field ◽  
Line Intensities ◽  
Spin Resonance ◽  
Crystalline Electric Fields

The angular variation of the intensities of the allowed and forbidden (Δm = ±1) electron spin resonance lines of Mn2+ impurities in tremolite, 2(H2Ca2Mg5(SiO3)8), was studied at room temperature and in the 9.2-GHz microwave frequency range. The crystalline electric field for the magnetic complex of Mn2+ in tremolite has orthorhombic symmetry, and this causes the line intensities to vary asymmetrically between the z and y magnetic axes. The experimental measurement of these intensities is in good agreement with the theoretical calculations of Bir (1964). Bir's theory has been used with success previously by others for ions in the higher-symmetry axial and cubic crystalline electric fields.

Electron spin resonance of palladium-related defect in silicon

2009 ◽  
Vol 404 (23-24) ◽  
pp. 4586-4589
Author(s):  
T. Ishiyama ◽  
S. Kimura ◽  
Y. Kamiura ◽  
Y. Yamashita
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Spin Resonance ◽  
Related Defect
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