Fast proton spin-lattice relaxation time in the rotating frame during the application of time averaged precession frequency.
A relatively rapid phase alternation of the effective field in the time averaged precession frequency (TAPF) sequence results in averaging of the proton RF spin-lock field. The spin-locking of the proton magnetization becomes less efficient and thus shortens T(1rho)(H), the proton spin-lattice relaxation time in the rotating frame. The relaxation time also depends on the ratio of tau(1) and tau(2) intervals i.e. tau(1)/tau(2) and not only on the number of tau(c)=tau(1)+tau(2) blocks, i.e. the number of the phase transients. Experiments are performed on solid samples of ferrocene and glycine and for some time intervals, T(1rho)(H) is shortened by factors of 9-100 compared to the relaxation times obtained in the standard experiment.
Zujović
Zoran D
ZD
Department of Chemistry, The University of Auckland, Private Bag 92019, Auckland, New Zealand. z.zujovic@auckland.ac.nz
Bowmaker
Graham A
GA
D002247:Carbon Isotopes; D005296:Ferrous Compounds / Q000737:chemistry; D005998:Glycine / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D000075163:Metallocenes; D011522:Protons; D013997:Time Factors
D002247:Carbon Isotopes; D005296:Ferrous Compounds; D000075163:Metallocenes; D011522:Protons; D005998:Glycine; C004998:ferrocene