Trapped Ions
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. Fotoionização com luz sìncroton de átomos de césio resfriados e aprisionados a laser / Light synchrotron photoionization of cesium atoms cooled trapped and laser
Este trabalho apresenta estudos experimentais de fotoionização de átomos resfriados e aprisionados a laser, utilizando luz sıncrotron como fonte de ionização, tendo um interesse especial na distribuição angular dos fotoelétrons ejetados na fotoionização, ou seja, na seção de choque diferencial. Até pouco tempo atrás, existiam poucos dados
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/10/2010
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2. Emaranhamento e comunicação quantica na interação entre cavidades acopladas, atomos e ions aprisionados / Entanglement and quantum communication in the interaction among coupled cavities
Nesta tese estudamos um sistema de duas cavidades acopladas e sua interação com átomos de dois níveis bem como com íons aprisionados. Para o acoplamento entre as cavidades consideramos dois mecanismos distintos: (1) acoplamento pela sobreposição dos campos e; (2) acoplamento via fibra óptica. Considerando a interação dos campos acoplados com átomo
Publicado em: 2008
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3. "Estudo do processo de complexação de calixarenos com íons metálicos e espécies neutras por simulações de dinâmica molecular" / A study of the complexation process of calixarenes with metallic ions and neutral species from molecular dynamic simulations
We report a series of Molecular Dynamics simulations, in vacuum and in acetonitrile solution, on the complexation process of the calixarens tetraethylester p-tert-butyl calix[4]arene (CLE) and tetramethylketone p-tert-butyl calix[4]arene (CLC) with Pb2+ and Cd2+ anions and neutral species. The solvent and calixarene molecules were modeled based on the OPLS-A
Publicado em: 2006
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4. Interactions of physical systems with applications in quantum optics and quantum information / Interações de sistemas fisicos com aplicações em optica e informação quantica
A presente tese é dedicada à utilização de conhecidos sistemas quânticos em aplicações de interesse em óptica e informação quântica. Motivados pelos recentes avanços experimentais em sistemas formados por íons aprisionados interagindo com lasers e na eletrodinâmica quântica de cavidades, nós focamos grande parte de nossas propostas nestes sis
Publicado em: 2006
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5. Espectroscopia e transferÃncia de energia em eidros La2O3-Nb2O5-B2O3
Glasses are amorphous materials with structures that can, in general, be described by a random non-periodic network model. Although for many glasses, mainly silicates, this model is appropriate, there are systems that present short and medium-range order (first and second coordination spheres) for which more sophisticated models are needed to describe their
Publicado em: 2003
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6. Collisionless dissipation of radio-frequency waves in axisymmetric tokamak plasmas
Contributions of trapped and untrapped particles to the transverse and longitudinal dielectric permittivity elements are present for radio-frequency waves in a tokamak with circular cross-sections of the magnetic surfaces and arbitrary aspect ratio. Imaginary parts of the longitudinal permittivity elements are important to estimate the wave power absorbed by
Brazilian Journal of Physics. Publicado em: 2002-03
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7. Dinamica de sistemas quanticos : atomos em cavidades de ions aprisionados
In this thesis we studied the dynamics of two quantum systems: atoms in a cavity and trapped ions. For atoms in a cavity ( QED ) , we studied the dynamics of field prepared in a superposition of coherent states and a statistical mixture. In this system, using a Intensity-Dependence Jaynes-Cummings model (DNJCM) we discuss some aspects of the dynamics of atom
Publicado em: 2002
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8. Direct spectroscopic observation of inner and outer hydrocarbon chains of lipid bilayer vesicles.
Distearoylphosphatidylcholines labeled with gem-difluoro groups at selected positions of the fatty acid chains have been prepared. These lipids were incorporated into sonicated vesicles and were examined by fluorine nuclear magnetic resonance spectroscopy. All spectra are characterized by two well-separated fluorine resonances. Paramagnetic ions added to the
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9. Molecular weight determination of plasmid DNA using electrospray ionization mass spectrometry.
Ionization and molecular weight (MW) determination of megadalton size plasmid DNA has been achieved using electrospray ionization (ESI) with Fourier transform ion cyclotron resonance (FTICR) mass spectrometry. DNA molecules were shown to remain intact through electrospray ionization by collection on a specially prepared surface, followed by agarose gel elect
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10. Excitation transfer spectroscopy with two metastable 138Ba+ ions in same trap.
In the absence of lasers approaching trapped ion clock transitions in sharpness we propose to replace the 12.49 m laser field exciting the D3/2-D5/2 transition of the single Ba+ ion A in D3/2 with the near-field of a close by identical ion B in the excited D5/2 state. We tune the frequency of the near-field by the differential Stark shift generated when the
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11. Occlusion of cobalt ions within the phosphorylated forms of the Na+-K+ pump isolated from dog kidney.
1. Co2+ ions can replace Mg2+ ions as co-factors for the Na+-K+ pump purified from dog kidney outer medulla. The evidence comes from (a) measurement of ouabain-sensitive Na+,K+-ATPase activity, (b) measurement of ATP-dependent 22Na uptake catalysed by the Na+-K+ pump reconstituted into phospholipid vesicles, (c) measurements of phosphorylation of the Na+-K+
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12. Potential role of conjugated bilirubin and copper in the metabolism of lipid peroxides in bile.
Conjugated bilirubin and copper ions at their physiological concentrations in bile may play an important role in hydroperoxide and other detoxification. Conjugated bilirubin may also be an important chain-breaking antioxidant preventing lipid peroxidation. Bilirubin ditaurine (BR-DT), a water-soluble model compound of conjugated bilirubin, completely prevent