Showing papers by "Robert Blinc published in 1972"
TL;DR: The 14N nuclear quadrupole resonance spectra and spin-lattice relaxation times of the amino acids histidine, methionine, cystine, Cysteine and tyrosine as well as of the nucleic bases uracil, thymine, cytosine, and guanine have been determined by a 14N-proton double resonance technique in the laboratory frame as mentioned in this paper.
Abstract: The 14N nuclear quadrupole resonance spectra and spin‐lattice relaxation times of the amino acids histidine, methionine, cystine, cysteine, and tyrosine as well as of the nucleic bases uracil, thymine, cytosine, and guanine have been determined by a 14N‐proton double resonance technique in the laboratory frame. The experiments were performed on polycrystalline samples at 77°K or above this temperature. A theoretical estimate of the sensitivity of this method for a variety of experimental conditions is as well presented. It is shown that in contrast to usual double resonance techniques the method works even in the case of a short proton spin‐lattice relaxation time if only the nitrogen relaxation time is long.
68 citations
TL;DR: In this article, it was shown that the mechanisms for proton spin-lattice relaxation in the nematic liquid crystalline phase in 4- n -methoxybenzylidene-4'- n -butylaniline (MBBA) is different from that in p -azoxyanisole (PAA) when the measurements of T 1 are extended to low frequencies.
37 citations
TL;DR: In this article, the authors used pulsed nitrogen double resonance in the rotating frame to determine the electric field gradient tensors at the 14N sites in paraelectric (NH4)2SO4.
29 citations
TL;DR: In this paper, the electric field gradient tensor at the Cs sites in CsH2AsO4 and the 133Cs spin-lattice relaxation rate at CsD2AO4 have been determined.
Abstract: The electric field gradient (EFG) tensor at the Cs sites in CsH2AsO4 and the 133Cs spin‐lattice relaxation rate in CsD2AsO4 have been determined. The results show that the time averaged value of the EFG tensor at the Cs site in the paraelectric phase is the average of the two ferroelectric EFG tensors for opposite directions of polarization, and that the time dependence of the Cs EFG fluctuations is determined by the same dynamic process which governs the EFG fluctuations at the deuteron sites in the O–D ··· O bonds.
18 citations
TL;DR: The vanishing of ferroelectricity in KH 2 PO 4 at high pressures reflects the fact that the transverse tunneling field has become equal to the longitudinal dipolar field so that no "longitudinal" ordering is possibly any more as discussed by the authors.
14 citations
5 citations
TL;DR: In this paper, the temperature dependence of the "ferroelectric" contribution to the specific heat in Rochelle salt has been calculated for the two sublattice model and it is found that the heat anomaly has the same sign at the lower and at the upper Curie point.
5 citations
4 citations