Theg-value

Fig. 4. EPR spectra of redox poised hydrogenase from T. roseopercisina. Theg values are indicated. (Reprinted with permission from (,64) copyright 1997, American Chemical Society).

Figure 5 Phase of a CIDNP net effect explained with vector models (projections). From left to right, starting state influence of theg-value difference influence of the nuclear spin state through the hyperfine coupling constant resulting population difference of the nuclear spin states in the product resulting CIDNP signal. The labels on the vector models denote the electron spin of radical 1 or 2. Further explanation, see text.

Notes ESR g and A( N) principal values in (a) and (b) were obtained from the simulation of CW ESR spectra observed at three different MW frequencies (multi-frequency ESR spectra). The E, A, I, SE, SA and SI values were evaluated from theg values and their distribution widths (5g). The computational DFT results correspond to the B3LYP/6-31+G(d) optimized geometry of the Na-NO complex in model 3A in [32]. 

An important advantage of using multi-frequency ESR spectroscopies is to separate the g and hyperfine (hf) A tensor components and to resolve the weak deviation (gxx-gyy) from the axially symmetry of theg tensor so as to evaluate accurate values of E, A and / according to Eqs. (6.1), (6.2) and (6.3). 

Fig.4 - 3-BCMU film obtained by evaporation of the solvent. Variation of theg second harmonic steady value with respect...

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