High-Frequency/High-Field Electron Spin Echo Envelope Modulation Study of Nitrogen Hyperfine and Quadrupole Interactions on a Disordered Powder Sample

Authors: Bloeß A.; Möbius K.; Prisner T.F.

Source: Journal of Magnetic Resonance, Volume 134, Number 1, September 1998 , pp. 30-35(6)

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Abstract:

High-frequency/high-field (95 GHz/3.4 T) electron spin echo envelope modulation (ESEEM) experiments on single crystals and disordered samples of dianisyl-nitroxide (DANO) radicals are reported. At these high microwave frequencies (W-band), the anisotropic g-matrix of the nitroxide radical is resolved in the EPR spectrum. Additionally ESEEM modulations from other than nitrogen nuclei, such as protons, are highly suppressed at these frequencies, because they are too far from the cancellation condition for effective mixing of the nuclear spin functions. Therefore the nitrogen (¹⁴N) hyperfine and quadrupole coupling tensors could be determined without ambiguity from powder measurements. The results obtained were checked by ESEEM measurements on single crystals. Advantages and disadvantages of high-field ESEEM on nitrogen couplings are briefly discussed and compared with electron nuclear double resonance (ENDOR) and X-band ESEEM. Copyright 1998 Academic Press.

Language: English

Document Type: Research article

Affiliations: Freie Universität Berlin, Arnimallee 14, Berlin, D-14195, Germany

Publication date: 1998-09-01