S-band electron spin echo spectroscopy
| Autor: | Wenjun Shi, R.B. Clarkson, R.L. Belford, H.C. Crookham, David R. Brown, Jeffrey B. Cornelius |
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| Rok vydání: | 1992 |
| Předmět: | |
| Zdroj: | Pure and Applied Chemistry. 64:893-902 |
| ISSN: | 1365-3075 0033-4545 |
| DOI: | 10.1351/pac199264060893 |
| Popis: | In order to explore the advantages of multi-frequency ESE experiments, we have constructed a pulsed EPR spectrometer operating over a microwave frequency range of 2-4 GHz (S-band). Dramatic enhancement of electron spin echo envelope modulation (ESEEM) depth is observed for weakly coupled nuclei. Well-defined resonance peaks corresponding to nearly pure NOR frequencies are observed for 14N in some nitroaromatic systems, at values of 6, near "exact cancellation" and more distant from the cancellation condition than had been predicted. In the case of nitrogen modulation in a copper(l1) complex with large g anisotropy, strong orientation selection is achieved at S-band as well as X-band; the S-band spectrum is different and complementary. |
| Databáze: | OpenAIRE |
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