Multiphoton Absorption
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Optically Detected Thermal Effects in Rare-Earth Doped Materials for Host Characterization, Thermometric Devices, Nanothermometry and Biothermometry
We present a review of recent works on optically investigated thermal effects in crystalline and amorphous materials doped with trivalent rare-earth (RE) ions. The paper describes how the frequency upconversion (UC) photoluminescence (PL) technique is used to investigate the thermal behavior of samples and how to perform optical measurements of temperature.
J. Braz. Chem. Soc.. Publicado em: 2015-12
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2. Relação entre a estrutura molecular e as propriedades de absorção de multi-fótons em compostos orgânicos π-conjugados / Structure-property relationship for multiphoton absorption process in π-conjugated organic compounds
Nesta tese estudamos a relação entre as propriedades de absorção de multi-fótons e a estrutura molecular de três classes distintas de compostos orgânicos π-conjugados: derivados de vitamina A, complexos de platina acetilada e compostos quirais. Materiais orgânicos emergiram nas últimas décadas como candidatos para aplicações em dispositivos fo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/07/2011
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3. Mecanismo da decomposição e reações com radicais em acetatos / Decomposition mecanism and radical reactions with acetates
Computational studies on methyl and ethyl acetates molecules using ab initio and density functional calculations exploring the unimolecular mechanism, induced by multiphoton absorption, and the bimolecular reactions with OH and Cl radicals, have been performed in this work. Analysis of the calculated energy barriers and rate constants of unimolecular reactio
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/05/2011
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4. Absorção de multi-fótons em polímeros e resinas poliméricas: espectroscopia não linear e microfabricação / Multi-photon absorption in polymers and polymeric resins: nonlinear spectroscopy and microfabrication
Nesta tese, estudamos o processo de absorção multifotônica em polímeros e resinas poliméricas, abordando tanto aspectos fundamentais quanto aplicados. Com relação aos aspectos fundamentais, estudamos processos de absorção multifotônica (absorção de dois, três e quatro fótons) no polímero conjugado MEH-PPV (poly(2-methoxy-5-(2´-ethylhexyloxy)-
Publicado em: 2009
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5. O comportamento fisico-quimico da mistura SF6+H2 irradiada pelo laser de CO2 : propriedades moleculares e reatividade quimica
This work had the intention of studing two relations envolved with the laser induced photochemical reactions. These reactions were those induced on the gas mixture of SF6 and H2 alone and in the presence of a solid (titanium, silicon, silica gel and glass wool) by the pulsed CO2 laser. The first kind of study is related to the chemical reactivity of the radi
Publicado em: 2001
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6. Reações de fotooxidação da amonia por LASER pulsado de gas carbonico e por descargas eletricas : aplicação a separação isotopica do deuterio da amonia natural
LASER photochemical reactions initiated by the multiphoton processs, were studied for various rrolecular systems. These studies indicated that the multiphoton excitation presents advantage af high selectivity and reactian yields. In our work we examined, the multiphoton excitation of Ammonia, in mixtures containing this gas and oxigen, using a pulse CO2 LASE
Publicado em: 1979
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7. Invited Review Article: Imaging techniques for harmonic and multiphoton absorption fluorescence microscopy
We review the current state of multiphoton microscopy. In particular, the requirements and limitations associated with high-speed multiphoton imaging are considered. A description of the different scanning technologies such as line scan, multifoci approaches, multidepth microscopy, and novel detection techniques is given. The main nonlinear optical contrast
American Institute of Physics.
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8. Laser-induced multiphoton processes in living cells.
It is shown that specific light-induced subcellular alterations, usually referred to as phase "paling," result from multiphoton absorption processes. For green light (532 nm), four photons are required to induce paling in chromosomes and nucleoli; a two-photon process is observed for UV light (266 nm).
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9. Gene inactivation by multiphoton-targeted photochemistry
Multiphoton-targeted photochemistry was used to selectively inactivate the expression of genes in vertebrate cells. A membrane permeable DNA-associating vital dye, ethidium bromide monoacetate (visible wavelength single photon absorption peak at 530 nm) was used to photosensitize chromosomes in dividing cells. A 100-ps infrared laser beam operating at 1.06 m
The National Academy of Sciences.
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10. Multiphoton fluorescence excitation: new spectral windows for biological nonlinear microscopy.
Intrinsic, three-dimensionally resolved, microscopic imaging of dynamical structures and biochemical processes in living preparations has been realized by nonlinear laser scanning fluorescence microscopy. The search for useful two-photon and three-photon excitation spectra, motivated by the emergence of nonlinear microscopy as a powerful biophysical instrume