G-values, table

Using the g-Value Table (90% Confidence Level as Table 73-1 we note that if Qn < g-Value, then the measurement is NOT an Outlier. Conversely, if Qn > g-Value, then the measurement IS an outlier. 

Where MPe represents the phthalocyanine in an excited triplet state. The CBr3 species is expected to dimerize rapidly following the reaction. The quantum yields of the resulting phthalocyanine n cation radical are shown in Table H. The EPR spectra obtained at 79 K for the ZnPc and RuPc n C U ion radicals give isotropic g values (Table II), which are very close to the free electron value of 2.0023 and are characteristic of the n caJtion radic ds of phthalocyanines (10,15). 

The absolute measurement of a g-value requires knowledge of the micro-wave frequency and the resonant magnetic field. However, standards with known g-value (Table 5.5.1) are often used to calculate the g-value of a lignin sample, according to the following formula ... 

Figure 5 shows typicdl EPR powder spectra of in octahedrai coordination, the host lattice being of the elpasolite type (Fig. 1). At very low temperatures the signal is anisotropic with g values (Table 1) ich are in agreement with Eq.(20).

The g-values (Table 1) are close to the free electron value of 2.0023, indicating ver> small spin-orbit coupling ( ) [7]. Although small, the contribution of from each band at the Fermi surface will add to the width of the EPR signal. In all cases, only a single Lorentzian line is observed. The g-value is temperature-independent, within the accuracy of the experiment. For p -(BEDT-TTF)2AuCl2 an increase in g-value is observed at the phase transition, characteristic of a transition to a SDW ground state. 

The [NiFe] center is rich in redox states. The oxidized states (Ni-A, Ni-B) are catalytically inactive and can be activated by reduction with molecular hydrogen. They differ in their activation kinetics Ni-A takes hours to be activated under hydrogen, while Ni-B takes only minutes [33]. For this reason the Ni-A state is also called the unready state and the Ni-B state the ready state. Both states are paramagnetic and are characterized by different g-values (Table 1). Upon one-electron reduction of Ni-A and Ni-B, the EPR-silent states Ni-SU and Ni-Slr are formed. For A. vinosum hydrogenase it has been shown that the Ni-A —> Ni-SU reduction is reversible, but the Ni-B —> Ni-Slr reduction strongly depends on pH and temperature. At pH 6.0 and 2°C the reduction was completely irreversible, at pH 8 and 30°C both reductions were reversible [16]. For vinosum hydrogenase... 

The examination that now takes place is mainly based on the prescriptions resulting from the processual or hazard analysis and concentrates on the suitability of the device for the specific application. This can also involve examination of documenation (e.g. value tables for... 

On the basis of these results, the relative scale of radiation resistance of aliphatic, alicyclic, aromatic, and ionic solid compounds may be immediately deduced. Table I summarizes these data including the G values, which have been obtained on assuming for vr an average value of 200. 

Table 16. Composition", frequency (co) beginning from which one may achieve coincidence of the G values and the shift factors b(c) at 190 °C [344]...

TABLE 3. G values of volatile products from poly(olefin sulfone)s... 

Typical values of g for some sulfonyl radicals are also listed in Table 2. Two main features stand out from these data. First, there is a decrease in the g-value as the electronegativity of the substituents increases, that is, MeSOj (2.0049), Me2NS02 (2.0036), MeOSOj (2.0032) and FSOj (2.0026), and second, there is an increase in the g-value when introducing atoms characterized by large spin-orbit couplings in positions of significant spin density of the radical (cf., for example, entries 7 and 9 as well as 10 and 11 in Table 2). 

Table I. g-values and Ueff of ground states In Russell-Saunders and intermediate coupling for different configurations.

Table I. The Lowest Level of Each Configuration of Pu I and Pu II with their Corresponding Lande g-Values and Experimental Isotope Shifts (E in cm-l and IS in 10-2 cm-l).

Fig. 13. Plot of the g values g,gz) and of the average g value vs rhombicity (Uj) of the Rieske and Rieske-type proteins listed in Table VIII. The lines represent linear fits to the data points.

It appears that Cluster C catalyzes the chemistry of CO oxidation and transfers electrons to Cluster B, which donates electrons to external acceptors such as ferredoxin. Since a crystal structure of this protein does not exist, the proposed structure of Cluster C is based on spectroscopic measurements. In some cases, the EPR spectrum of a metal center is diagnostic of the type of center. However, the EPR spectra of Cluster C are unusual. The paramagnetic states of Cluster C (Credi and Cred2) have g-values that are atypical of standard [4Fe-4S] clusters (Table III) and are similar to those in a variety of structurally unrelated systems including a t-oxo bridged ion dimer), a [Fe4S4] ... 

Next, each difference was transformed into a g-value according to Eq. (1.25). With 70 - 9 = 61 degrees of freedom, the critical -value for the longest diagonal (adjacent means) would be 2.83, that for the top right corner (eight interposed means) 3.33, see Table 1.11. For this evaluation sep-... 

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