High-resolution TPPAC experiments with fast BaF2 scintillators

Baudry, A.; Boyer, P.; Vulliet, P.

doi:10.1007/bf01027256

Cited by 14 publications

(3 citation statements)

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“…In addition, 181 Hf (T 1/2 = 42d) is easily produced by thermal neutron capture: 180 Hf (n, γ ) 181 Hf. The quadrupole interaction (QI) of 181 Ta in commercial coarse-grained HfO 2 has been extensively investigated in the past [114][115][116][117][118][119][120], and the results for the absolute values of the QI parameters and their temperature dependence obtained by different authors agree well between them. More recently, investigations of thin films [121,122] and nanoparticles [123] of HfO 2 have been reported.…”

Section: Defects and Diffusion Studied Using Pac Spectroscopymentioning

confidence: 88%

Impurity Centers in Oxides Investigated by γ-γ Perturbed Angular Correlation Spectroscopy and <i>Ab Initio</i> Calculations

Pasquevich

Rentería

2011

DDF

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Abstract. In this chapter Perturbed Angular Correlation (PAC) experiments on binary oxides are described. These experiments provide local-scale fingerprints about the formation, identification, and lattice environment of defect complexes at the PAC probe site. The potential of the PAC observations in conjunction with ab initio calculations is shown. Measurements of the electric-field gradient at impurity sites using 111 Cd and 181 Ta probes are reviewed. Special attention is paid to oxides with the bixbyite structure. The case of In 2 O 3 is particularly analyzed. Results obtained with HfO 2 , in form of coarse grain or nano particles, are described. The potential results that can be obtained from Density Functional Theory ab initio calculations in doped systems are shown describing the main results observed in many impurity-host systems.

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Section: Defects and Diffusion Studied Using Pac Spectroscopymentioning

confidence: 88%

Impurity Centers in Oxides Investigated by γ-γ Perturbed Angular Correlation Spectroscopy and <i>Ab Initio</i> Calculations

Pasquevich

Rentería

2011

DDF

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“…They reflect the characteristic EFG at the sites of the Hf-ions due to the electronic configuration of the molecular orbits. A Lorentzian distribution of the EFGs was assumed (Baudry et al 1983). The parameter 6 describes the width of this distribution.…”

Section: W(o T) = ~ A~ G~ (T) P~ (Cos ~9) With Even Vmentioning

confidence: 99%

Influence of protein dynamics on the metal-sites of ovotransferrin

et al. 1992

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Using the perturbed angular correlations (PAC) technique, the formation of hafnium-ovotransferrin complexes has been studied. Two binding configurations at each of the two specific binding-sites of the protein have been observed. They are characterized by well-defined electric quadrupole frequencies. Information about the dynamics of the protein was derived from temperature dependent measurements of the relaxation constant. The well-resolved spectra taken with fast BaF2-detectors allow a precise determination of the relaxation behaviour of the protein. The results are compared with the predictions from a hydrodynamic model for the reorientation of macromolecules. Thus the hydrodynamic volume of ovotransferrin and its N-terminal half-molecule were determined. The ovotransferrin volume is in agreement with a value derived for human serum transferrin from small angle neutron scattering. From experiments with immobilized protein material there is evidence for internal protein dynamics which is probed by the Hf-ion bound to the specific metal-sites.

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“…After these natural minerals or simple alkali halide materials, Bi 4 Ge 3 O 12 (BGO) single crystal was developed during the 1970s and 80s, [23][24][25] and up to now, BGO has been the highest effective atomic number (Z eff ) commercial material. One of the fastest scintillators, BaF 2 , 26) was also introduced in this era. BaF 2 single crystal shows a very fast scintillation by Auger free luminescence (AFL), although the very short emission wavelength at vacuum ultraviolet range limits the application of BaF 2 to practical applications.…”

Section: Introductionmentioning

confidence: 99%