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6 MEASUREMENT OF RELAXATION TIME
6.5
RELAXATION TIME MEASUREMENT OF
RECT OBSERVATION USING CP METHOD
In the solid-state NMR, when measuring the relaxation time of the
observation can be performed using the CP method. When the spectrum of
and cannot be observed directly, or when the sample consists of many elements, this in-
direct observation method is effective. The principle and measurement procedures are the
same as that of the measuring method by direct observation.
■ Relaxation time measurement by inversion-recovery method
When the relaxation time of
CPMAS, the following pulse sequence is used.
inversion_recovery_1h_cpmas.jxp
In the usual inversion-recovery method using CPMAS, the inversion-recovery method is
performed after the magnetization transfer. However, in the relaxation-time measurement
of
1
H, the magnetization transfer is performed after the inversion-recovery method.
■ Measurement of T
The following pulse sequence is used for measuring the T
1
H by the CPMAS method.
cpmas_spin_lock_1h.jxp
Although the spin lock is applied after magnetization transfer in the usual T
ment, the magnetization transfer is performed after the spin lock in the T
of the
1
H nucleus.
6-6
H is measured by using the inversion-recovery method with
1
ρ
1
1
H BY INDI-
1
H nucleus, indirect
H is broad
1
(T
in the rotating frame) of
ρ
1
1
measure-
ρ
1
measurement
ρ
1
NMECAXS_V50-SLD-2
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