The 14N NQR from the host lattice of the thiourea-carbon tetrachloride inclusion compound. From calorimetric measurements, two phase transitions are known to occur at 67.2 K and 41.3 K in this compound. Above the 67.2 K transition, the 14N NQR spectrum consists of one resonance, though a small splitting of about 0.5 kHz is seen at temperatures up to ca. 105 K. Below the transition, the resonanc...

The influence of impurities on the N NQR lineshape of Na1_^AgcN02 and [NaN02],_,[BN03]^ (B = Na, K) at room temperature has been investigated. Carrying out spectral analysis in conjunction with classification of the local field inhomogeneities according to the structurally isomorphic, Na]_xAgxN02, and anisomorphic [NaNO^.JBNC^b systems, enabled an understanding of the microscopic nature of impu...

the aim of this research is studying the effects of ge-doped on co adsorption on the outer and inner surfaces of (6, 0) zigzag model of boron nitride nanotube (bnnts) by using dft theory. for this purpose, eight models of co adsorption on the surfaces of bnnts are considered. at first step, all structures were optimized at b3lyp and 6-31g (d) standard base set and then the electronic structure,...

NQR of Cu in YBa2Cu3O ö 95 was investigated before and after low-temperature electron irradi­ ation as well as after annealing at several distinct temperatures up to 440 K. Irradiation with 2.76 MeV electrons (fluence (f)t = 2.2 ■ 1023 e_/m2) decreased the critical temperature Tc from 91.8 K to 89.5 K. The NQR spectra indicate that the e~ irradiation displaces so-called 0(4) atoms in the Cu-O c...

Fifteen methyl-, nitro-, or mixed substituted N-(phenyl)-2-chloroacetamides were investigated by C1 NQR. The temperature dependence of the frequencies of the 3-methylphenyl and 2,6-dimethylphenyl derivatives were studied for the range 77 K<T<300 K. Only one co C-Cl frequency was observed for the compound with the two exceptions. For N-(2-nitro,4-chlorophenyl)-2-chloroacetamide the observed valu...

The addition of certain solutes to a water Cerenkov detector will introduce new charge-current channels for the detection of νes. The experimental conditions necessary to exploit such signals large volumes and very low backgrounds should be reached for the first time in SuperKamiokande and SNO. I compare some of the more attractive possibilities (7Li, 11B, 35Cl) in terms of counting rate, relia...