โ Scribed by A. K. Khitrin; V. V. Laiko; B. N. Provotorov
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
Polycrystalline cortisone (17,21-dihydroxy-4-pregnene-3,11,20\_trione, C,,H2s0,) has been investigated by proton NMR methods between 56 and 400 K at 14 and 25 MHz. Reductions in second moment and two very well-resolved minima in the spin-lattice relaxation time at both frequencies are attributed to
Proton Zcoman-and dipolar spin-lattice rekxation times and second moments have been measured in polycrystallinc SiH4 at 24 %IHz, between 90 and 3 K. Down to 25 K the classical model for molecular motion appibs; below 25 EC, quantum effects have to be taken into account.
Structural influences on both the isotropic NMR chemical shift and resonance linewidth of "Y are investigated by obtaining magic-angle spinning NMR spectra from a number of solid-state yttrium aluminate and silicate phases. These clearly show that the isotropic chemical shift for 89Y is dependent on