Trapped Atoms
Mostrando 1-12 de 36 artigos, teses e dissertações.
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1. Carbon Distribution in Ferritic-Martensitic Fe-Cr-C Alloys
Carbon distribution in Fe-Cr-C alloys with a variety of Cr concentrations is studied based on internal friction, optical and transmission-electron microscopy. It is found that the carbon distribution strongly depends on initial microstructure, being ferritic or ferritic/martensitic, which is determined by the thermal treatment, and Cr and carbon concentratio
Mat. Res.. Publicado em: 28/05/2018
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2. Termodinâmica de condensados aprisionados em armadilhas óptico-magnéticas / Thermodynamic studies on BECs trapped by hybrid traps
In this master thesis we present some preliminary studies on the Thermodynamics of ultracold gases in inhomogeneous potentials. These studies were performed in two different experimental setups using the new global variables proposed by V. Romero-Rochín, which we call volume parameter and pressure parameter. The first system is the experiment built in our l
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2012
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3. Montagem e caracterização de uma armadilha magneto-óptica de rubídio / Mounting and characterization of a rubidium magneto-optical trap
In this work we present the building and characterization of a Magneto-Optical Trap (from now on named MOT) for Rubidium atoms. We perform experiments for studying the eect of a broadband light over trapped atoms. In order to carry out this study we used a incandescent lamp which is broad in the wavelength spectrum. We observed in a MOT, with a number of 109
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/07/2011
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4. Trapping state stabilization in a micromaser with a mixed atomic beam
A scheme which stabilizes the trapping states in micromasers is proposed and studied. It uses an atomic beam composed of a mixture of two types of atoms. Numerical simulations based on the Monte Carlo wavefunction method show that, despite collective events, it is possible to obtain a steady-state photon number distribution limited (‘‘trapped’’) to a
Publicado em: 2011
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5. 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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6. Geração e proteção de estados comprimidos do campo e estados atômicos emaranhados em cavidades ópticas
In this work we investigated the engineering of interactions and reservoirs in the context of Cavity Quantum Electrodynamics. The investigated system consists of two identical three-level atoms trapped in two distinct traps, but inside the same optical cavity, inte- racting with the cavity mode and driven by classical .elds to manipulate the atom-.eld intera
Publicado em: 2010
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7. Desenvolvimento de um laser de Nd:YLF bombeado por diodo laser e duplicado em frequencia para 657 nm / Development of a diode pumped Nd:YLF laser, frency doubled to 657 nm
Atomic clocks are used today in a number of scientific and technological applications, ranging from tests of relativity, or variations of fundamental constants, to the use in navigation and telecommunication. The next generation of such high precision devices will be based on optical transitions of suitable laser cooled and trapped atoms. In this work we des
Publicado em: 2009
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8. Construção de uma armadilha magneto-ótica para aplicações em informação quântica e física atômica / Construction of a Magnet-Optical Trap for Aplications at Quantum Information and Atomic Physics
We built a magneto-optical trap (MOT) for rubidium as a first step for the trapping of a cloud of cold atoms in a periodic potential formed by light beams. This system will be used for experiments in atom physics, with possible applications in quantum information. A MOT is necessary to avoid the problems imposed by the thermal agitation of the atoms to the m
Publicado em: 2009
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9. Photoassociative ionization in situations with low dimensions / Investigação do processo de foto-ionização associativa em situações com baixa dimensão
Photoassociative ionization (PAI) in a cold sample of sodium atoms was the main subject of our studies as a way to understand the effects of repulsive states and collision dimensions. Two-color PAI experiment were preformed in a magneto-optical trap (MOT) trough the addition of a probe laser beam, the intensity, polarization and frequency of that probe laser
Publicado em: 2009
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10. How can encapsulated C60 fullerenes escape from a carbon nanotube?: A molecular dynamics simulation answer
This work aim is to determine how a C60 fullerene, encapsulated into a (10,10) carbon nanotube, can be ballistically expelled from it by using a colliding capsule. Initially, the C60 fullerene is positioned at rest inside the nanotube. The capsule, also starting from rest but outside of the nanotube, is put in a position such that it can be trapped towards t
Brazilian Journal of Physics. Publicado em: 2008-03
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11. Processos binários em átomos de Rydberg / Binary process in Rydberg atoms
This dissertation seeks to address some of the characteristics of collisional processes in ultracold Rydberg atoms. With a Maqneto-Optical Trap (MOT), we trapped a sample of 85Rb, an alkaline metal element, in a region of about lmm at a temperature of a few hundreds of ?K, known in the literature as the "ultracold" regime. The 85Rb atoms are then excited to
Publicado em: 2006
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12. Construção de uma armadilha de dipolo com laser de CO2. / Constrution of a dipole trap using a CO2 laser
In this work we present the construction of an optical dipole trap using a CO2 laser, which involves the use of news and modern technologies never utilized by our group up to now. We have builded a new trap chamber with large optical access, used atomic dispensers as an atomic source and a high power CO2 laser and its optical components. We have demonstrated
Publicado em: 2006