Nitrogen-15 spin-lattice relaxation by spin-(internal rotation)
β Scribed by Joseph B Lambert; Daniel A Netzel
- Publisher
- Elsevier Science
- Year
- 1975
- Weight
- 164 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0022-2364
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π SIMILAR VOLUMES
The spin-lnttice rclaxltion of I% nuclei in inorganic ions is governed by inter-nnd intramoleculnl dipole-dipole and shift anisotropy intcrnctions at lowzr tcmpcrntures and by the spin-rotation interaction at higher temperatures. The mensured relnxttion rntes lcsd to rcasonablc rnlues for the 15~ s
SelectIre NhlR TI mrasurements on dcutermm m pouders rotatrng at high speed at the magtc angle mdtcate that dlpolat spm dlffusmn ~~hich can bc quenched by the ortentattonal dependence of the quadrupole spbttmg, IS partially restored by the simple rotatton
## Abstract The small negative magnetogyric ratio (Ξ³) of the ^15^N nucleus decreases the efficiency of ^15^Nο£Ώ^1^H dipoleβdipole relaxation to about 25% of that for an analogous ^13^C nucleus. This may lead to greater competition from other relaxation mechanisms in ^15^N n.m.r. and consequent partia
The correlation time for proton motion in pure ice has been directly determined by measuring the frequency dependence of the rotating frame proton spin-lattice relaxation time Tip. The results show that the motion which determines proton spin-lattice relaxation is indeed by an order of magnitude fas