EPR investigation of atoms in chemical traps
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 pha...
Saved in:
Published in | Carbon (New York) Vol. 38; no. 11; pp. 1635 - 1640 |
---|---|
Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Oxford
Elsevier Ltd
2000
Elsevier Science |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | 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
13C 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. |
---|---|
ISSN: | 0008-6223 1873-3891 |
DOI: | 10.1016/S0008-6223(00)00092-0 |