Determination of the hyperfine coupling constant and zero-field splitting in the ESR spectrum of Mn2+ in calcite

2005 ◽  
Vol 44 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Eugenio Garribba ◽  
Giovanni Micera
Keyword(s):  
Hyperfine Coupling ◽  
Hyperfine Coupling Constant ◽  
Zero Field ◽  
Coupling Constant ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Esr Spectrum

ARAGONITE TO CALCITE TRANSFORMATION STUDIES BY ESR OF Mn2+ IONS IN SINOTAIA INGALLSIANA

2009 ◽  
Vol 23 (09) ◽  
pp. 1243-1247
Author(s):  
NITINAI UDOMKAN ◽  
PICHET LIMSUWAN
Keyword(s):  
Hyperfine Coupling ◽  
Fine Powder ◽  
Hyperfine Coupling Constant ◽  
Freshwater Snail ◽  
Zero Field ◽  
Coupling Constant ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Air Atmosphere ◽  
Biomineralization Process

We have studied paramagnetic Mn 2+ ions present in the freshwater snail, Sinotaia ingallsiana (FS), Viviparus which are abundant in Thailand. The FS shells in our study were ground into fine powder. A set of seven samples was each then separately annealed for 2 hours in air atmosphere at 300°C, 400°C, 500°C, 600°C, 700°C, 800°C and 900°C, respectively. Our detailed ESR spectral analyses of FS show that Mn 2+ ions enter Ca 2+ sites during a biomineralization process. The hyperfine coupling constant (A) and zero-field splitting (D) in the ESR spectrum of Mn 2+ in calcite and aragonite were determined. The spreading of the non-central allowed transitions was analyzed and the experimental transitions were attributed. For calculating the hyperfine coupling constant, five methods for calculating the zero-field splitting, based on the analysis of the allowed and forbidden transitions, were provided. The values of the hyperfine coupling constant range from 87.50 to 89.00 G and those of the zero-field splitting range from 110.00 to 116.00 G.

Determination of the zero field splitting and exchange narrowing of epr linewidth in Cr3+ delafossite-type oxides

1988 ◽  
Vol 49 (4) ◽  
pp. 377-379 ◽  
Author(s):  
J.M. Dance ◽  
A. Wichainchai ◽  
P. Dordor ◽  
E. Marquestaut ◽  
J.P. Doumerc ◽  
...  
Keyword(s):  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Exchange Narrowing

scholarly journals The Coordination Chemistry of Phosphoryl Compounds Containing the -N(CH3)2 Group, XII.

1973 ◽  
Vol 28 (3-4) ◽  
pp. 104-106 ◽  
Author(s):  
M.W.G. De Bolster ◽  
B. Nieuwenhuijse ◽  
J. Reedijk
Keyword(s):  
Electron Spin Resonance ◽  
Metal Ion ◽  
Room Temperature ◽  
Esr Spectroscopy ◽  
Hyperfine Coupling ◽  
Hyperfine Coupling Constant ◽  
Zero Field ◽  
Coupling Constant ◽  
Spin Resonance ◽  
Temperature Electron

Room temperature electron spin resonance powder spectra have been recorded for some compounds of the type Mn(ligand)p(anion)2 with hexamethylphosphoramide and nonamethylimidodiphosphoramide as ligands (p = 1 - 4) and BF-4, NO-3, Cl-, Br-, I- and NCS-as anions.The values for the zero-field parameters, D and λ, have been determined and are compared with literature data. It is shown that ESR spectroscopy can be very helpful in elucidating the structures of manganese(II) complexes.The high values for the hyperfine coupling constant of the solvates suggest that in these complexes the bonding between the ligands and the metal ion is essentially ionic.

Multi-frequency EPR determination of zero field splitting of high spin species in liquids: Gd(III) chelates in water

1998 ◽  
Vol 95 (6) ◽  
pp. 1325-1332 ◽  
Author(s):  
R. B. CLARKSON ◽  
ALEX I. SMIRNOV ◽  
T. I. SMIRNOVA ◽  
H. KANG ◽  
R. L. BELFORD ◽  
...  
Keyword(s):  
High Spin ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Spin Species
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