Isotropic effective g-values in high-spin systems [Pg.203]

Comparing the strain-induced anisotropic part of the effective g-value in Equation 9.24 with the linewidth Equation 9.18 for fully correlated g-strain reveals a remarkable correspondence they are equivalent (apart from a sign ambiguity) within the substitutions [Pg.164]

FIGURE 5.10 The rhombogram for S = 5/2. Effective g-values of the three intradoublet transitions have been plotted as a function of the rhombicity q = E/D assuming greal = 2.00 and S S S B. [Pg.85]

At intermediate orientations the effective g values will also be intermediate. Consider a molecule oriented so that the magnetic field makes an angle 9 with [Pg.100]

FIGURE 7.1 S = 3/2 rhombograms for weak-field and intermediate-field conditions. Effective g-values are plotted for v = 9.50 GHz and D = 3.0 cm"1 (weak field solid lines) or D = 0.3 cm"1 (intermediate field broken lines) as a function of the rhombicity E/D. [Pg.123]

Figure 10. EPR spectrum of [ZuFejS ] " recorded at 8 K. The lower panel shows energy levels and effective g>values for an S = 5/2 system with D < 0 and E/D = 0.25, where D and E are the zero field splitting parameters. |

Effective atomic number Rule, 24 226 and cluster compounds, 24 230-231 exceptions, 24 226-227, 235 and mononuclear species, 24 234-235 Effective g values, calculation, 38 195-197 EF hand domains, calcium-binding proteins, 46 442, 443 45 [Pg.88]

ESEEM is a pulsed EPR technique which is complementary to both conventional EPR and ENDOR spectroscopy(74.75). In the ESEEM experiment, one selects a field (effective g value) in the EPR spectrum and through a sequence of microwave pulses generates a spin echo whose intensity is monitored as a function of the delay time between the pulses. This resulting echo envelope decay pattern is amplitude modulated due to the magnetic interaction of nuclear spins that are coupled to the electron spin. Cosine Fourier transformation of this envelope yields an ENDOR-like spectrum from which nuclear hyperfine and quadrupole splittings can be determined. [Pg.385]

If the Ln3+ centre is a Kramers ion, the spectra can be interpreted in terms of a doublet with largely anisotropic effective -values. If one neglects the admixture of higher lying/ multiplets and considers an axial symmetry, the effective g values will be [Pg.19]

FIGURE 5.11 EPR of an S = 5/2 system with pronounced rhombicity. The X-band spectra (V = 9.31 GHz) are from high-spin FeIH in Escherichia coli iron superoxide dismutase. The observed effective g-values correspond to T = 0.24 in the S = 5/2 rhombogram. [Pg.86]

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