Relaxation calculations for rapidly spinning samples show that spin-lattice relaxation time (T 1Z ) anisotropy varies with the angle between the rotor spinning axis and the external field. When the rate of molecular motion is in the extreme narrowing limit, the measurement of T 1Z anisotropies for t
A pulse sequence for the measurement of short spin-lattice relaxation times for carbon-13 in solid polymers
✍ Scribed by Anita Findlay; Robin K. Harris
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 294 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
A pulse sequence is presented which allows measurement of short T~1~ values (< 1 s) in solids, avoiding probe damage by the use of saturating sequences of 90° pulses. The use of the sequence is illustrated for a cross‐linked polymeric system which contains composite peaks having both short‐T~1~ and long‐T~1~ components.
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## Abstract ^13^C spin–lattice relaxation times (__T__~1~'s) are reported for C‐3 of 2‐methylindole (methyl,3‐^13^C~2~) as a function of the concentration of added 1,3,5‐trinitrobenzene at 35°C in 1,2‐dichloroethane. The observed decreases in __T__~1~, with increasing concentrations of 1,3,5‐trinit
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