Mt. Bennebroek et J. Schmidt, PULSED ENDOR SPECTROSCOPY AT LARGE THERMAL SPIN POLARIZATIONS AND THEABSOLUTE SIGN OF THE HYPERFINE INTERACTION, Journal of magnetic resonance [1997], 128(2), 1997, pp. 199-206
Citations number
15
Categorie Soggetti
Physics, Atomic, Molecular & Chemical","Biochemical Research Methods
It is shown that in pulsed Mims-type ENDOR experiments performed at 95
GHz and 1.2 K the sign of the ENDOR signal can be positive, correspon
ding to an increase of the stimulated echo intensity, as well as negat
ive, corresponding to a decrease of the stimulated echo. The positive
''anomalous'' sign is not observed at conventional EPR frequencies. It
is explained that the effect arises through spin-lattice relaxation i
n the situation of large thermal spin polarizations and that it allows
the determination of the absolute sign of the hyperfine interaction.
(C) 1997 Academic Press.