The Nuclear Quadrupole Interaction of 204mPb in Lead Oxides

Abstract

The nuclear quadrupole interaction of 204m Pb in lead oxides has been measured by g-g time differential perturbed angular correlation. Ab-initio calculations of the electric field gradients and X-ray diffraction allowed the assignment of the detected nuclear quadrupole interactions to the different Pb sites in the PbO phases litharge and massicote as well as in Pb 3 O 4 . The TDPAC probe 204m Pb was produced with a 204 Bi/ 204m Pb-generator at the home laboratory at the University of Leipzig. The use of a high performance liquid chromatography system increased significantly the yield, the specific activity of 204m Pb, and reduced the acidic concentration of the eluate.

Application of 204mPb Perturbed Angular Correlation of γ-rays Spectroscopy in Coordination Chemistry

“…This approach has been demonstrated to adequately reproduce fully relativistic four-component CCSD( T ) calculations of EFGs for Hg-halides . Only a very limited number of quantum mechanical calculations of EFGs in lead(II)-containing compounds are found in the literature. , The calculated EFGs for the two model systems are V zz = 2.32 au, η = 0.59 for [Pb(i-mnt) 2 ] 2– and V zz = 1.51 au, η = 0.77 for [Pb 2 (i-mnt) 4 ] 4– . The prior EFG gives a too large V zz and a too low η compared to the experimentally derived value ( V zz = ±1.72(8) au, η = 0.970(7), using Q = 0.44(2)), whereas the latter agrees reasonably well with experiment.…”

TDPAC andβ-NMR applications in chemistry and biochemistry

“…)) [24]. The recorded experimental data showed only one signal indicating that a single Pb II coordination geometry is present in the sample.…”

“…More recently, 204m Pb/Pb has also appeared as a probe in chemical applications of TDPAC spectroscopy [23]. It may become useful because of its greater sensitivity to deviations of the EFG from axial symmetry than other usual TDPAC probes [24]. Its long intermediate state half-life of 260 ns, Q=0.44(2) b and μ=+0.225(4) μ N [25] should allow performing γ-γ TDPAC measurements for very weak EFGs, characterised by low frequencies of the perturbation function.…”

Measurements of ${}^{nat}Pb(p,xn){}^{201-207}Bi$, ${}^{204}Pb(p,1-4n){}^{201-204}Bi$ and ${}^{206}Pb(p,3n){}^{204}Bi$ cross-sections at astrophysical energies ($E_p \leq 30 \, MeV$)

“…This has important implications in nucleosynthesis, since this γ is a delayed one and should be considered in dynamic models. It is also important in high performance liquid chromatography (HPLC) and time differential perturbed angular correlation (TDPAC) in macromolecules, [25]. The work of Cross [26] as adopted in Chiara and Kondev [27] (NDS) measured first the γ's and levels and then concluded that the 911.7 keV γ was compatible with IT level of 204m P b.…”