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4 ADJUSTMENT OF MEASUREMENT CONDITIONS AND PROCESSING CONDITIONS
4.2
SETTING WAITING TIME IN SINGLE PULSE
MEASUREMENT
The optimum value of relaxation_delay in a single-pulse measurement is determinded
by T
of the observed nucleus. When the measurement is carried out using a 90° pulse,
1
theoretically the accumulation efficiency (= signal intensity/accumulation time) becomes
optimum if relaxation_delay is about 1.2 times the T
in the following figure). When T
angle obs_angle_prep and measure it.
However, when performing a quantitative measurement, setup the relaxation_delay to 5
or more times the longest T
Fig. 4.1 Accumulation efficiency and signal intensity versus the ratio of the
The accumulation efficiency becomes its maximum at relaxation_delay/T
Since the efficiency will decrease quickly if you set a shorter relaxation_delay, you
will need to set a slightly longer relaxation_delay.
4-2
of the observed nucleus is very long, set a small flip
1
among the observed peaks.
1
)
relaxation_delay/T
relaxation_delay/T
waiting time (relaxation_delay) and the T
observed nucleus
of the observed nucleus (as shown
1
Single pulse
1
Single pulse
1
(relaxation time) of the
1
NMECAXS_V50-SLD-2
= 1.2.
1
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