Electron Nuclear Double Resonance of Transition Metal by A. Schweiger

By A. Schweiger

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Extra info for Electron Nuclear Double Resonance of Transition Metal Complexes with Organic Ligands

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4) and the generation of multiple quantum coherence by high rf fields (Sect. 5) facilitate the interpretation of ENDOR spectra in many cases. The recent development of ENDOR with circularly polarized rf fields (Sect. 6) and of polarization modulated ENDOR spectroscopy (Sect. 7) has been introduced either to reduce the number of the observed ENDOR transitions or to characterize each ENDOR line by additional parameters. Finally, the envelope modulation of electron spin echoes and the related electron spin echo ENDOR spectroscopy (Sect.

An improvement in orientation selectivity is obtained by orienting planar paramagnetic compounds in nematic glasses (Sect. 1). Overlapping EPR or ENDOR spectra of transition metal complexes may be separated by using wide range ENDOR-induced EPR (Sect. 2) and DOUBLE ENDOR (Sect. 3), respectively. The technique of selective decoupling of nuclear dipole-dipole interactions (Sect. 4) and the generation of multiple quantum coherence by high rf fields (Sect. 5) facilitate the interpretation of ENDOR spectra in many cases.

Rotating field. h. rotating field. h. rotating field, only nuclei which belong to molecules with an electron spin state ms = 1/2 and which have a hf coupling a ~ > 2/~NgnB0will contribute to the ENDOR spectrum. 20). h. h. 1). The nuclear transition probability is then given by 41 ENDOR with Circularly Polarized rf Fields (CP-ENDOR) ms-_1y Fig. 22 a, b. Orientation of the effective field Be, and sense of rotation of the circularly polarized driving field for induction of nuclear transitions. S = 1/2, I = 1/2, isotropic hf coupling ai,o> 0, g, > O.

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