In a Gedanken experiment one can prepare a molecule with a well-defined orientation. This
is equivalent to having fixed labeled protons of the molecule (numbers 1 to N) on labeled …

1. Introduction.................................................................. 360 2. The hindered methyl
group....................................................... 360 2.1. The rotational eigenstates and the tunnelling …

A single-crystal pulsed neutron diffraction study of p-hydroxyacetanilide (the analgesic
Paracetamol, C8H9NO2) was carried out at 100 K. The structure, in good agreement with …

Nuclear magnetic resonance (NMR) investigations of methyl tunneling in 2, 5‐dimethyl‐1, 3,
4‐thiadiazole are reported. The tunneling frequency (ν t= 3.39 MHz) was obtained using low …

Fast field cycling (FFC) NMR has been relatively little used for solids. This is partly due to
instrumental problems and because normal perturbation theory no longer applies when …

The crystal structure of perdeuterated dimethylsulphide, S (CD3) 2, has been solved ab initio
from high-resolution neutron powder diffraction data at low temperature. The structure is …

1H NMR spin–lattice relaxation time measurements have been carried out in [(CH3) 4N]
2SeO4 in the temperature range 389–6.6 K to understand the possible phase transitions …

Abstract (CH3) 4NGeCl3 is prepared, characterized and studied using 1H NMR spin lattice
relaxation time and second moment to understand the internal motions and quantum …

The rotational tunnel splittings of pairs of methyl groups in dimethyl sulphide have been
determined by low field proton NMR as a function of hydrostatic pressure up to 4· 5 kBar …

Experiments are described in which the rotation of methyl groups in solids at helium
temperatures is driven using external magnetic fields. The orientation of the nuclear …