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Nikl M, Vedda A, Pazzi GP, Mihokova E, Fasoli M, Pejchal J, Bohacek P, Yoshikawa A, Ren G, Nejezchleb K. Tunnelling processes-driven radiative recombination in complex oxide scintillators. ACTA ACUST UNITED AC 2010. [DOI: 10.1088/1742-6596/249/1/012018] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Popescu FF, Bercu V, Barascu JN, Martinelli M, Massa CA, Pardi LA, Stefan M, Nistor SV, Nikl M, Bohacek P. Erratum: “Study of the ground multiplet of Kramers rare earth ions in solid matrices by multifrequency electron paramagnetic resonance spectroscopy: Nd3+ in PbWO4 single-crystals” [J. Chem. Phys. 131, 034505 (2009)]. J Chem Phys 2009. [DOI: 10.1063/1.3280223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Popescu FF, Bercu V, Barascu JN, Martinelli M, Massa CA, Pardi LA, Stefan M, Nistor SV, Nikl M, Bohacek P. Study of the ground multiplet of Kramers rare earth ions in solid matrices by multifrequency electron paramagnetic resonance spectroscopy: Nd3+ in PbWO4 single-crystals. J Chem Phys 2009; 131:034505. [PMID: 19624207 DOI: 10.1063/1.3180697] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A multifrequency electron paramagnetic resonance (EPR) investigation of Nd(3+) impurities in PbWO(4) single-crystals at the conventional microwave frequency (MF) 9.43 GHz, and at the 95, 190, and 285 GHz high frequencies was carried out. The resulting spectra are well described at all frequencies by an axial spin-Hamiltonian corresponding to an effective electron spin of one-half and to a tetragonal symmetry. For the magnetic field along the tetragonal axis, the g(parallel)-factor and the hyperfine constant A(parallel) of the lowest doublet of the ground multiplet decreases with frequency increase. For the magnetic field perpendicular to the tetragonal axis, the g(perpendicular)-factor exhibits a small azimuthal angular dependence that increases with increasing the frequency due to the S(4) site symmetry. The azimuthal angular dependence allows to clearly distinguish between different local axial symmetries. These properties are interpreted as high field/frequency (HF) effects associated with the mixing by the large Zeeman interaction of some of the upper-lying doublets of the ground multiplet into the lowest-lying doublet states. We show that from the combined analysis of the multifrequency MF- and HF-EPR spectra and of the optical data, an accurate description of the ground multiplet of the Kramers rare earth ions in solid matrices can be derived.
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Affiliation(s)
- F F Popescu
- Department of Physics, University of Bucharest, Magurele, RO-077125 Bucharest, Romania.
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Bohacek P, Fabeni P, Krasnikov A, Nikl M, Pazzi GP, Susini C, Zazubovich S. Defects creation under UV irradiation of PbWO4 crystals. Radiat Prot Dosimetry 2006; 119:164-7. [PMID: 16581927 DOI: 10.1093/rpd/nci580] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
A systematic study of photothermally stimulated defects creation processes is carried out by the thermally stimulated luminescence (TSL) method for a large number of undoped and doped PbWO4 crystals under irradiation at 80-180 K in the 3.4-4.3 eV energy range. The activation energy Ea for the regular exciton state disintegration is found to be approximately 0.1 eV. For defect-related states disintegration, Ea varies in the crystals studied from 0.03 to 0.36 eV. The origin of the defect-related states is discussed. The conclusion is made that not only a release of charge carriers but also charge transfer processes take place under UV irradiation of PbWO4 crystals.
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Affiliation(s)
- P Bohacek
- Institute of Physics AS CR, Cukrovarnicka 10, 162 53 Prague, Czech Republic
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Bohacek P, Fabeni P, Krasnikov A, Nikl M, Pazzi G, Susini C, Zazubovich S. Defects in UV‐irradiated PbWO
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: Mo crystals monitored by TSL measurements. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/pssc.200460230] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- P. Bohacek
- Institute of Physics AS CR, Cukrovarnicka 10, 162 53 Prague, Czech Republic
| | - P. Fabeni
- Institute of Applied Physics IFAC‐CNR, Via Panciatichi 64, 50127 Florence, Italy
| | - A. Krasnikov
- Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia
| | - M. Nikl
- Institute of Physics AS CR, Cukrovarnicka 10, 162 53 Prague, Czech Republic
| | - G.P. Pazzi
- Institute of Applied Physics IFAC‐CNR, Via Panciatichi 64, 50127 Florence, Italy
| | - C. Susini
- Institute of Applied Physics IFAC‐CNR, Via Panciatichi 64, 50127 Florence, Italy
| | - S. Zazubovich
- Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia
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Mares J, Beitlerova A, Bohacek P, Nikl M, Solovieva N, D'Ambrosio C. Influence of non-stoichiometry and doping on scintillating response of PbWO4 crystals. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/pssc.200460114] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Babin V, Bohacek P, Bender E, Krasnikov A, Mihokova E, Nikl M, Senguttuvan N, Stolovits A, Usuki Y, Zazubovich S. Decay kinetics of the green emission in tungstates and molybdates. RADIAT MEAS 2004. [DOI: 10.1016/j.radmeas.2004.02.005] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Pazzi G, Fabeni P, Susini C, Nikl M, Bohacek P, Mihokova E, Vedda A, Martini M, Kobayashi M, Usuki Y. Recombination luminescence in lead tungstate scintillating crystals. RADIAT MEAS 2004. [DOI: 10.1016/j.radmeas.2004.02.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Nikl M, Bohacek P, Mihokova E, Baccaro S, Vedda A, Diemoz M, Longo E, Kobayashi M, Auffray E, Lecoq P. Radiation damage processes in wide-gap scintillating crystals. New scintillation materials. ACTA ACUST UNITED AC 1999. [DOI: 10.1016/s0920-5632(99)00589-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Baccaro S, Bohacek P, Borgia B, Cecilia A, Croci S, Dafinei I, Diemoz M, Fabeni P, Ishii M, Kobayashi M, Martini M, Montecchi M, Nikl M, Nitsch K, Organtini G, Pazzi GP, Usuki Y, Vedda A. Radiation Damage and Thermoluminescence of Gd-Doped PbWO4. ACTA ACUST UNITED AC 1997. [DOI: 10.1002/1521-396x(199712)164:23.0.co;2-z] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Baccaro S, Bohacek P, Borgia B, Cecilia A, Dafinei I, Diemoz M, Ishii M, Jarolimek O, Kobayashi M, Martini M, Montecchi M, Nikl M, Nitsch K, Usuki Y, Vedda A. Influence of La3+-Doping on Radiation Hardness and Thermoluminescence Characteristics of PbWO4. ACTA ACUST UNITED AC 1997. [DOI: 10.1002/1521-396x(199704)160:23.0.co;2-l] [Citation(s) in RCA: 77] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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