The Experts below are selected from a list of 12246 Experts worldwide ranked by ideXlab platform
Gregory W Tomlins - One of the best experts on this subject based on the ideXlab platform.
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zinc self diffusion electrical properties and defect structure of undoped single crystal zinc oxide
Journal of Applied Physics, 2000Co-Authors: Gregory W Tomlins, J L Routbort, Thomas O MasonAbstract:Zinc self-diffusion was measured in single crystal zinc oxide using nonradioactive 70Zn as the Tracer Isotope and secondary ion mass spectrometry for data collection. Crystal mass was closely monitored to measure ZnO evaporation. Diffusion coefficients were isotropic with an activation energy of 372 kJ/mol. Zinc self-diffusion is most likely controlled by a vacancy mechanism. Electrical property measurements exhibit a plateau in conductivity at intermediate pO2 with an increase in reducing atmospheres. An analysis of the defect structure is presented that indicates that oxygen vacancies are probably the intrinsic ionic defects responsible for n-type conductivity in reducing atmospheres.
Klaus Wendt - One of the best experts on this subject based on the ideXlab platform.
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High resolution spectroscopy of the hyperfine structure splitting in ^97,99Tc
Hyperfine Interactions, 2017Co-Authors: Sebastian Raeder, Pascal Schönberg, Tobias Kron, Reinhard Heinke, Jose L. Henares, Nathalie Lecesne, Marcel Trümper, Klaus WendtAbstract:Resonance ionization mass spectrometry is an efficient tool for detecting trace amounts of long-lived radio-Isotopes in environmental samples. For absolute quantification a Tracer with identical atomic properties and chemical behavior is needed to prevent a possible dependency onto the absolute efficiency for the analytical method. For an application in ^99Tc, the Isotope ^97Tc could serve as a potential Tracer. Therefore the optical transitions of an efficient ionization scheme for technetium were investigated for the two odd mass Isotopes ^97,99Tc, both with a nuclear spin of I = 9 2 $\frac {9}{2}$ . Using a pulsed, single mode laser with narrow bandwidth, the hyperfine structures (HFS) of two transitions were fully resolved. The observed Isotope shift is small in comparison to the width of the hyperfine structure splitting. This is ideal for the application of ^97Tc as Tracer Isotope for ^99Tc quantification. The evaluation of the observed HFS splitting results in a first experimental value for the magnetic dipole for ^97Tc of μ =+5.82(9) μ _ N .
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High resolution spectroscopy of the hyperfine structure splitting in$^{97,99}$Tc
Hyperfine Interactions, 2017Co-Authors: Sebastian Raeder, Pascal Schönberg, Tobias Kron, Reinhard Heinke, Jose L. Henares, Nathalie Lecesne, Marcel Trümper, Klaus WendtAbstract:Resonance ionization mass spectrometry is an efficient tool for detecting trace amounts of long-lived radio-Isotopes in environmental samples. For absolute quantification a Tracer with identical atomic properties and chemical behavior is needed to prevent a possible dependency onto the absolute efficiency for the analytical method. For an application in 99Tc, the Isotope 97Tc could serve as a potential Tracer. Therefore the optical transitions of an efficient ionization scheme for technetium were investigated for the two odd mass Isotopes 97,99Tc, both with a nuclear spin of I=\(\frac {9}{2}\). Using a pulsed, single mode laser with narrow bandwidth, the hyperfine structures (HFS) of two transitions were fully resolved. The observed Isotope shift is small in comparison to the width of the hyperfine structure splitting. This is ideal for the application of 97Tc as Tracer Isotope for 99Tc quantification. The evaluation of the observed HFS splitting results in a first experimental value for the magnetic dipole for 97Tc of μ=+5.82(9) μN.
Thomas O Mason - One of the best experts on this subject based on the ideXlab platform.
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zinc self diffusion electrical properties and defect structure of undoped single crystal zinc oxide
Journal of Applied Physics, 2000Co-Authors: Gregory W Tomlins, J L Routbort, Thomas O MasonAbstract:Zinc self-diffusion was measured in single crystal zinc oxide using nonradioactive 70Zn as the Tracer Isotope and secondary ion mass spectrometry for data collection. Crystal mass was closely monitored to measure ZnO evaporation. Diffusion coefficients were isotropic with an activation energy of 372 kJ/mol. Zinc self-diffusion is most likely controlled by a vacancy mechanism. Electrical property measurements exhibit a plateau in conductivity at intermediate pO2 with an increase in reducing atmospheres. An analysis of the defect structure is presented that indicates that oxygen vacancies are probably the intrinsic ionic defects responsible for n-type conductivity in reducing atmospheres.
Sebastian Raeder - One of the best experts on this subject based on the ideXlab platform.
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High resolution spectroscopy of the hyperfine structure splitting in ^97,99Tc
Hyperfine Interactions, 2017Co-Authors: Sebastian Raeder, Pascal Schönberg, Tobias Kron, Reinhard Heinke, Jose L. Henares, Nathalie Lecesne, Marcel Trümper, Klaus WendtAbstract:Resonance ionization mass spectrometry is an efficient tool for detecting trace amounts of long-lived radio-Isotopes in environmental samples. For absolute quantification a Tracer with identical atomic properties and chemical behavior is needed to prevent a possible dependency onto the absolute efficiency for the analytical method. For an application in ^99Tc, the Isotope ^97Tc could serve as a potential Tracer. Therefore the optical transitions of an efficient ionization scheme for technetium were investigated for the two odd mass Isotopes ^97,99Tc, both with a nuclear spin of I = 9 2 $\frac {9}{2}$ . Using a pulsed, single mode laser with narrow bandwidth, the hyperfine structures (HFS) of two transitions were fully resolved. The observed Isotope shift is small in comparison to the width of the hyperfine structure splitting. This is ideal for the application of ^97Tc as Tracer Isotope for ^99Tc quantification. The evaluation of the observed HFS splitting results in a first experimental value for the magnetic dipole for ^97Tc of μ =+5.82(9) μ _ N .
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High resolution spectroscopy of the hyperfine structure splitting in$^{97,99}$Tc
Hyperfine Interactions, 2017Co-Authors: Sebastian Raeder, Pascal Schönberg, Tobias Kron, Reinhard Heinke, Jose L. Henares, Nathalie Lecesne, Marcel Trümper, Klaus WendtAbstract:Resonance ionization mass spectrometry is an efficient tool for detecting trace amounts of long-lived radio-Isotopes in environmental samples. For absolute quantification a Tracer with identical atomic properties and chemical behavior is needed to prevent a possible dependency onto the absolute efficiency for the analytical method. For an application in 99Tc, the Isotope 97Tc could serve as a potential Tracer. Therefore the optical transitions of an efficient ionization scheme for technetium were investigated for the two odd mass Isotopes 97,99Tc, both with a nuclear spin of I=\(\frac {9}{2}\). Using a pulsed, single mode laser with narrow bandwidth, the hyperfine structures (HFS) of two transitions were fully resolved. The observed Isotope shift is small in comparison to the width of the hyperfine structure splitting. This is ideal for the application of 97Tc as Tracer Isotope for 99Tc quantification. The evaluation of the observed HFS splitting results in a first experimental value for the magnetic dipole for 97Tc of μ=+5.82(9) μN.
Pascal Schönberg - One of the best experts on this subject based on the ideXlab platform.
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Application of Resonance Ionization Mass Spectrometry for Ultratrace Analysis of Technetium
Analytical Chemistry, 2017Co-Authors: Pascal Schönberg, C. Mokry, Jörg Runke, Daniela Schönenbach, Nils Stöbener, P. Thörle-pospiech, Norbert Trautmann, Tobias ReichAbstract:This work shows the ability of resonance ionization mass spectrometry (RIMS) to determine 99gTc at the ultratrace level. The characterization of the prepared samples by X-ray photoelectron spectroscopy (XPS) and optimization of the RIMS setup for this purpose, as well as the application of the RIMS method to a soil sample, are presented in this article. 97Tc was used as a Tracer Isotope to determine the amount of 99gTc in a soil sample with RIMS. With 8.8 × 1010 atoms of 97Tc as the Tracer, the concentration of 99gTc was found to be 1.5 × 109 atoms per gram of dried sample material, demonstrating the sensitivity of the method. Furthermore, it could be shown that the 97Tc solution contained 98Tc as well. This is the first time that 97,98,99gTc have been simultaneously measured with RIMS.
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High resolution spectroscopy of the hyperfine structure splitting in ^97,99Tc
Hyperfine Interactions, 2017Co-Authors: Sebastian Raeder, Pascal Schönberg, Tobias Kron, Reinhard Heinke, Jose L. Henares, Nathalie Lecesne, Marcel Trümper, Klaus WendtAbstract:Resonance ionization mass spectrometry is an efficient tool for detecting trace amounts of long-lived radio-Isotopes in environmental samples. For absolute quantification a Tracer with identical atomic properties and chemical behavior is needed to prevent a possible dependency onto the absolute efficiency for the analytical method. For an application in ^99Tc, the Isotope ^97Tc could serve as a potential Tracer. Therefore the optical transitions of an efficient ionization scheme for technetium were investigated for the two odd mass Isotopes ^97,99Tc, both with a nuclear spin of I = 9 2 $\frac {9}{2}$ . Using a pulsed, single mode laser with narrow bandwidth, the hyperfine structures (HFS) of two transitions were fully resolved. The observed Isotope shift is small in comparison to the width of the hyperfine structure splitting. This is ideal for the application of ^97Tc as Tracer Isotope for ^99Tc quantification. The evaluation of the observed HFS splitting results in a first experimental value for the magnetic dipole for ^97Tc of μ =+5.82(9) μ _ N .
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High resolution spectroscopy of the hyperfine structure splitting in$^{97,99}$Tc
Hyperfine Interactions, 2017Co-Authors: Sebastian Raeder, Pascal Schönberg, Tobias Kron, Reinhard Heinke, Jose L. Henares, Nathalie Lecesne, Marcel Trümper, Klaus WendtAbstract:Resonance ionization mass spectrometry is an efficient tool for detecting trace amounts of long-lived radio-Isotopes in environmental samples. For absolute quantification a Tracer with identical atomic properties and chemical behavior is needed to prevent a possible dependency onto the absolute efficiency for the analytical method. For an application in 99Tc, the Isotope 97Tc could serve as a potential Tracer. Therefore the optical transitions of an efficient ionization scheme for technetium were investigated for the two odd mass Isotopes 97,99Tc, both with a nuclear spin of I=\(\frac {9}{2}\). Using a pulsed, single mode laser with narrow bandwidth, the hyperfine structures (HFS) of two transitions were fully resolved. The observed Isotope shift is small in comparison to the width of the hyperfine structure splitting. This is ideal for the application of 97Tc as Tracer Isotope for 99Tc quantification. The evaluation of the observed HFS splitting results in a first experimental value for the magnetic dipole for 97Tc of μ=+5.82(9) μN.