EPR investigation of atoms in chemical traps

Autor:	Klaus-Peter Dinse, N. Weiden, H. Käß, C. Knapp
Rok vydání:	2000
Předmět:	Phase transition Fullerene Condensed matter physics Chemistry Doping General Chemistry Molecular physics Magnetic field law.invention Paramagnetism law General Materials Science Crystallite Electron paramagnetic resonance Magnetic dipole
Zdroj:	Carbon. 38:1635-1640
ISSN:	0008-6223
Popis:	By performing high-resolution EPR and ENDOR experiments on nitrogen atoms encapsulated in C 60 , the capability of the quartet spin system to sense small local fields at the site of the atom is demonstrated. Such symmetry lowering can either be induced by chemical modification of the cage or by a phase transition in polycrystalline C 60 . Additional line splittings in the EPR spectrum indicate the presence of a non-vanishing zero-field-splitting. Freezing of cage rotation can be observed via the magnetic dipole interaction with 13 C nuclei of the carbon shell resulting in broadening of ENDOR transitions. Fluctuating magnetic fields originating from additional paramagnetic species in solution can also be detected by their influence on the spin relaxation times.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ae3f9fdf85ef2b46841c784c7d8eab3e https://doi.org/10.1016/s0008-6223(00)00092-0 Zobrazit plný text záznamu Full Text from ScienceDirect