1994
DOI: 10.1002/cmr.1820060204
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Abstract: An evaluation of the relationship between signal‐to‐noise ratio (S/N) and integral accuracy, as a function of tip angle and relaxation delay, shows that the SIN decreases with increasing integral accuracy. At the expense of a slight decrease in integral accuracy, a substantial increase in SIN can be realized, and a procedure is presented for selecting the appropriate tip angle and relaxation delay.

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Cited by 25 publications
(17 citation statements)
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“…Spectra were taken with a 74°¯ip angle, an acquisition time of 1.5 s, and a delay of 4.0 s. In these conditions the spectra are 90% quantitative if only carbon atoms that have a relaxation time (T 1 ) inferior to 2.0 s are taken into account. 21 Figure 1 shows the activity of (nBuCp) 2 ZrCl 2 , homogeneous and supported on silica. By comparing both sets of each system, we can observe that the catalytic activities were higher in the case of the homogeneous catalytic system.…”
mentioning
confidence: 99%
“…Spectra were taken with a 74°¯ip angle, an acquisition time of 1.5 s, and a delay of 4.0 s. In these conditions the spectra are 90% quantitative if only carbon atoms that have a relaxation time (T 1 ) inferior to 2.0 s are taken into account. 21 Figure 1 shows the activity of (nBuCp) 2 ZrCl 2 , homogeneous and supported on silica. By comparing both sets of each system, we can observe that the catalytic activities were higher in the case of the homogeneous catalytic system.…”
mentioning
confidence: 99%
“…We suspect that these conditions may not be suitable for studying a transient system. In the experiments listed in this work, we made use of the recommendations in recent literature for improving NMR analyses (Traficante, 1992;Traficante and Steward, 1994). These articles showed that a 74" tip angle, and a pulse repetition period (PR) to relaxation time ratio (PR/Tl) of 2, yield 90% integral accuracy.…”
Section: Discussionmentioning
confidence: 97%
“…A pulse width of 29 ps and a pulse repetition period of 20 s were used in all experiments. This set of parameters yields a signal-to-noise ratio that is 30% higher than that of a previously accepted procedure called the 90"-wait 5T1 method (Traficante and Steward, 1994). Signal-to-noise ratio is proportional to the square root of the number of scans of each sample (Traficante, 1991).…”
Section: Discussionmentioning
confidence: 98%
“…The chemical shifts were referenced to Me 4 Si. Spectra were taken with a 74° flip angle, an acquisition time of 1.5 s, and a delay time of 4.0 s. Under these conditions the spectra are 90% quantitative, considering carbon atoms that have a relaxation time ( T 1 ) shorter than 2.0 s 21…”
Section: Methodsmentioning
confidence: 99%