Perturbed angular correlation measurements of electric field gradient at the metal site in M4Hf(C2O4)4 · nH2O(M = Na, K, Rb, Cs, NH4) compounds

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

doi:10.1016/0009-2614(78)87023-7

Cited by 7 publications

(2 citation statements)

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“…However it is worth reminding that the E.F.G. in eight coordinated complexes is very sensitive to lattice distortions [10]. The presence of recoil fragments in the neighbourhood of the restored molecule, resulting for example from exchange reactions, can induce significant modification of the quadrupolar coupling parameters at the 181 Ta nucleus.…”

Section: Resultsmentioning

confidence: 99%

Differential Perturbed Angular Correlation Measurements in Reactor Irradiated and Thermal Annealed Tetrakis-(dl-mandelate) Hafnium(IV)

et al. 1978

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Tetrakis (dl-mande!atej hafniumflV) / y,y angular correlation Summary Retention and thermal annealing effects following (n, 7) reaction were measured in solid tetrakis(dl-mandelate) hafnium(IV) by time differential measurements of the 133-482 keV y, y angular correlation of 181 Ta. The irradiation of the inactive compound with thermal neutrons 3 leads to a large spreading of the quadrupolar interaction parameters Q,(/) = s + V" which does not allow the characterization of a definite radioactive ^0 hafnium atom site. n ~ The thermal treatment permitted the detection of the quadrupolar interaction parameters as they were determined in the labelled compound and the analysis of the data revealed an important proportion of molecular reformation. the Legendre polynomials and τ the mean-life of the intermediate level of angular momentum I. The value of fc max depends on the spins of the levels and on the multipolarities of the gamma transitions. The coefficient s G fc (f) contain all the information on the perturbation. In the case of a spin I = 5/2 of the intermediate level, s kn cos ( u n t ) e -(δ u> n t+ 2 <+>n Τβ)

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Section: Resultsmentioning

confidence: 99%

Differential Perturbed Angular Correlation Measurements in Reactor Irradiated and Thermal Annealed Tetrakis-(dl-mandelate) Hafnium(IV)

et al. 1978

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“…HfB 2 [29], HfCl 4 [30] and biscyclopentadienyl hafnium chloride [31 ] have also been investigated. Pursuing VARGAS' line, several authors have collected TDPAC data on octocoordinated neutral tetrakis complexes of Hf(IV), sometimes in connection with hot atom research, with the ligands oxalate [32], tropolone, cupferon and N-benzoyl-N-phenylhydroxylamine [33]. In the latter two compounds, two Hf sites which might correspond to different geometrical configurations, appear from the Fourier transform of the PAC pattern.…”

Section: ) Experiments With 181 Hfmentioning

confidence: 98%