Hyperfine Interaction
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. Electronic Effect of V, Ti, and Sc Impurities on the Hyperfine Interactions of Fe Atoms in α-Fe: A First Principles Study
The Linearized Augmented Plane Wave method, as implemented in the Wien2k computational code, was used to investigate the effects of the 3d transition metals (TM) Sc, Ti, and V impurities on the hyperfine interaction of iron atoms in α-Fe. The calculation results of this study suggest that the introduction of a TM (TM = Sc, Ti, and V) impurity into α-Fe inc
Mat. Res.. Publicado em: 02/03/2017
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2. Investigação de interações hiperfinas em pó e filmes finos de dióxido de háfnio pela técnica de correlação angular gama-gama perturbada / Hyperfine Interaction study in the powder and thin films of HfO2 by Perturbed Angular Correlation Technique
Neste trabalho foi realizada a investigação de interações hiperfinas em amostra nano estruturadas e filmes finos de dióxido de háfnio por meio da técnica de correlação angular gama-gama perturbada (CAP), com o intuito de realizar um estudo sistemático do comportamento dos parâmetros quadrupolares com a temperatura de tratamento térmico. Para a re
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/01/2012
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3. Estudo do acoplamento spin-órbita de multipartículas confinadas em pontos quânticos semicondutores
Spin-orbit (SO) coupling provides a way for orbital degrees of freedom to influence spin states. As a result the spin dynamics is affected, thus making spin qubit (quantum version of bit, basic unit of information in the computational language) operations more complex. Furthermore, spin-orbit coupling leads to spin decoherence and relaxation due to phonons,
Publicado em: 2009
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4. Estudos estruturais de histatina-5 e seu análogo, TOAC0-histatina-5: interação com metais e sistemas biomiméticos / Structural studies of Histatin-5 and its analogue, TOAC0-Histatin-5: interaction with metals and biomimetic systems
The mechanism of action of histatin-5 (Hst-5), an antifungal antimicrobial peptide from human saliva is not completely clarified. Circular dichroism (CD), fluorescence, and electron paramagnetic resonance (EPR) were used to examine the conformational behavior of Hst-5 and its analogue containing the paramagnetic amino acid TOAC at the N-terminus (TOAC0-Hst-5
Publicado em: 2008
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5. Charmed-meson scattering on nucleons in a QCD Coulomb gauge quark model
The scattering of charmed mesons on nucleons is investigated within a chiral quark model inspired on the QCD Hamiltonian in Coulomb gauge. The microscopic model incorporates a longitudinal Coulomb confining interaction derived from a self-consistent quasi-particle approximation to the QCD vacuum, and a traverse hyperfine interaction motivated from lattice si
Brazilian Journal of Physics. Publicado em: 2007-03
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6. Processos redoxes de ferro em argilominerais: caracterização, métodos de quantificação, especiação e modificações estruturais
Redox processes within clays and clay minerals influence significantly in different physical and chemical properties in soils and sediments, mainly which ones related to the chemical interaction between solid and solution phases (liquid or gas) such as superficial charge and ion dynamics. Other, like expansibility, water retention capacity, surface area, and
Publicado em: 2007
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7. Estudo de interações hiperfinas em compostos intermetálicos Gd(Ni,Pd,Cu)In, Tb(Ni,Pd)In, Dy(Ni,Pd)In e Ho(Ni,Pd)In / Study of hyperfine interactions in intermetalic compounds Gd(Ni,Pd,Cu)In , Tb(Ni,Pd)In, Dy(Ni,Pd)In and Ho(Ni,Pd)In
Neste trabalho investigou-se o comportamento sistemático do campo hiperfino magnético nos compostos intermetálicos Gd(Ni,Pd,Cu)In , Tb(Ni,Pd)In, Dy(Ni,Pd)In e Ho(Ni,Pd)In, com a técnica de Correlação Angular γ-γ Perturbada, nos sítios dos elementos terras raras com o núcleo de prova 140Ce e no sítio do In com o núcleo de prova 111Cd. Os
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/02/2006
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8. Spin dynamics of electrons and holes in p-doped InAs/GaAs quantum dots
We have investigated the electron and hole spin dynamics in p-doped semiconductor InAs/GaAs quantum dots by time resolved photoluminescence. We observe a decay of the average electron spin polarisation down to 1/3 of its initial value with a characteristic time of TD » 500ps. We attribute this decay to the hyperfine interaction of t
Brazilian Journal of Physics. Publicado em: 2006-06
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9. On the interaction of Bovine Serum Albumin (BSA) with cethyltrimethyl ammonium chloride surfactant: Electron Paramagnetic Resonance (EPR) study
Electron paramagnetic resonance (EPR) has been used to monitor the interaction of bovine serum albumin (BSA) with cationic cethyltrimethylammonium chloride (CTAC) at pH 7.0. EPR results using 5-DSA and 16-DSA nitroxide spin labels show that in the presence of BSA the EPR spectra are composed of two label populations, one contacting the protein and a second o
Brazilian Journal of Physics. Publicado em: 2006-03
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10. Estudo de efeitos coerentes e geraÃÃo de luz com momento angular orbital vua mistura de ondas em Ãtomos de cÃsio frios
We have investigated phase-conjugate four-wave mixing (FWM) processes in magneto-optically cooled cesium atoms. We studied the generation of a coherent beam of light carrying orbital angular momentum, nondegenerate four-wave-mixing process in a Zeeman degenerate three-level system and a spontaneous coherence grating transfer mechanism. In the generation of b
Publicado em: 2005
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11. Mössbauer spectroscopy, superparamagnetism and ferrofluids
Some fundamentals of Mössbauer spectroscopy and of fluctuating magnetic hyperfine interactions are reviewed. An expression for calculation of spin-phonon interaction transition probabilities on the ground of a Debye model is given. Basic ideas of superparamagnetism and classical results for low-temperature relaxation rates are presented. A theory of superpa
Braz. J. Phys.. Publicado em: 2001-09
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12. Estudos dos momentos magneticos em solidos por ressonancia paramagnetica eletronica
Electron Paramagnetic Resonance (EPR) of magnetic impurities (3d e 4f) in single crystals and powdered samples is a subject of importance in the study of magnetic impurities in solids. The study and analysis of the EPR spectra is the main subject of this work. We developed computational algoritms to simulate and fit EPR spectra, using a suitable Spin Hamilto
Publicado em: 2000