In the past 15 years workers in the field of NMR have witnessed theoretical and instrumental advances that have culminated in the detection and routine use of isotopically rare nuclei in magnetic resonance studies. O magnetic resonance, however, remains a relatively unexploited area despite the obvious biological and chemical importance of the oxygen atom. The difficulty in studying O is due to...

classical trajectory (monte carlo) calculation is used to calculate collision rate constants of ion-quadrupolar molecule interactions for the h¯+c2h2 system. the method presented here takes into account the effect of the induced dipole-induced dipole potential on ion-quadrupolar molecule collision rate constants. it is also assumed that the colliding particles have a definite size. the thermal ...

Multiple-quantum magic-angle-spinning ~MQMAS NMR! spectroscopy has become a routine method to obtain high-resolution spectra of quadrupolar nuclei. One of the main problems in the performance of this experiment has been the poor efficiency of the radio-frequency pulses used in converting multiple-quantum coherences to the observable single-quantum signals. As the MQMAS experiment is basically a...

Interest in the solid state nuclear magnetic resonance (NMR) spectroscopy of half-integer quadrupolar spins is strongly stimulated by the roles that these isotopes play in a variety of important systems such as minerals, structural ceramics, semiconductors, glasses, and catalysts.' In spite of the partly ionic nature of these materials, quadrupole interactions with surrounding electric field gr...

The nuclear quadrupole transverse relaxation process of half-integer spins in liquid samples is known to exhibit multi-exponential behaviors. Within the framework of Redfield's relaxation theory, exact analytical expressions for describing such a process exist only for spin-3/2 nuclei. As a result, analyses of nuclear quadrupole transverse relaxation data for half-integer quadrupolar nuclei wit...

This paper presents an overview of recently developed methods for the indirect detection of 14N nuclei (spin l = 1) in spinning solids by nuclear magnetic resonance spectroscopy. These methods exploit the transfer of coherence from a neighboring 'spy' nucleus with spin S = 1/2, such as 13C or 1H, to single- or double-quantum transitions of 14N nuclei. The two-dimensional correlation methods pre...

The two neutrino and neutrinoless double beta decay of Zr, Mo, Ru, Pd, Te and Nd isotopes for the 0 → 0 transition is studied within the PHFB framework along with an effective two-body interaction consisting of pairing, quadrupole-quadrupole and hexadecapole-hexadecapole correlations. It is found that the effect of hexadecapolar correlations can be assimilated substantially as a renormalization...

We present the formal theory of the nuclear magnetic relaxation of spin 1/2 A in a scalar coupled spin system AMX with quadrupolar nuclei of spin 1 (M, X) considering cross-correlation relaxation based on second order time-dependent perturbation theory and the product operator formalism. The expressions for longitudinal and transverse relaxation times and dynamic frequency shifts of each compon...

The nuclear quadrupole coupling constant was calculated as a function of inter nuclear distance for nine quadrupolar nuclei in eight diatomic molecules by the STO 321G method. From the value of the field-gradient and its first and second derivatives the vibrational dependence of the coupling constants were calculated and shown to compare satisfactorily with experiment. The behaviour of the fiel...