Helium Atom
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Espectroscopia de alcalinos em Hélio líquido / Spectroscopy of Alkali in Liquid Helium
Alkali atoms are good probes for the understanding of liquid He properties. As such considerable experimental attention has been devoted to the analysis of the changes of line position and widths of the absorption spectra of alkali atoms in liquid He environment. On the theoretical side, several studies have used simplified models such as bubble and cluster
Publicado em: 2010
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2. Espaço do momento: modelos da química quântica / Momentum Space: Quantum Chemistry Models
In a conventional course in Quantum Chemistry, the models usually presented to illustrate the use of some quantum mechanical tools that are relevant for a comprehension of the structure of matter at the atomic and molecular levels are approached in a way that has been termed, in a more formal presentation, as position representation. In this representation,
Publicado em: 2008
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3. Alignment and photoionization of helium atom / Alinhamento Iônico na fotoionização do átomo de hélio por luz polarizada
Neste trabalho, descrevemos os conceitos de alinhamento e orientação baseados no formalismo de Fano e Macek e estudamos a fotoionização do estado fundamental do átomo de Hélio. Para isso usou-se uma função de onda aproximada obtida a partir da diagonalização do operador de Gailitis- Damburg. A anisotropia do sistema formado após a colisão foi car
Publicado em: 1997
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4. Nonadiabatic couplings in the hyperspherical method. / Acoplamentos não-adiabáticos pelo método hiperesférico.
Soluções não-adiabáticas em coordenadas hiperesférica para sistemas coulombianos de três corpos são apresentadas. Energias altamente precisas para o estado fundamental do hélio são obtidas, pela primeira vez, no método adiabática hiperesferico (HAA). Com a inclusão de somente três curvas de potencial e os correspondentes acoplamentos, precisão
Publicado em: 1993
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5. Aplicação da representação analitica das amplitudes de Born ao estudo de potenciais de dispersão e de espalhamento eletron-atomo
Two distinct problems have been studied using simplifield Born s Amplitude Analytical Expressions. The first problem deals with the dispersion energy between the constituent members of the systems He - Ne, He - H2 and H2 - H2. In the second problem second order Born Approximation has been used for the Electron - Atom Inelastic Scattering for the transitions
Publicado em: 1985
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6. Sobre o perfil de Compton do átomo de hélio / On the Compton profile of the helium atom
Em vista de recentes determinações experimentais do perfil de Compton (Eisenberger, Phys. Rev., A2, 1678(1970); Wellenstein e Bonham, Phys. Rev., A7, 1568(1973}, procuramos efetuar um estudo comparativo de cálculos teóricos do perfil de Compton para o átomo de hélio (1S). Para tal, o conjunto de funções de onda elaboradas por Shull e L6wdin (J.Chem.P
Publicado em: 1976
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7. LOWER BOUNDS FOR EIGENVALUES WITH APPLICATION TO THE HELIUM ATOM
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8. ON THE MOTION OF A SPHERE IN A PERFECT FLUID, WITH APPLICATION TO LIQUID HELIUM*
Momentum relationships involved in the motion of a sphere through a perfect fluid are considered. The mechanism, by which the momentum given to a sphere by an external impulsive force is transferred to the container as a whole, is traced through in some detail, and energy and momentum relationships are discussed. Comparison is made with a 3He atom or a roton
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9. Dielectric constant of atomic fluids with variable polarizability
The Clausius-Mossotti function for the dielectric constant is expanded in terms of single atom and pair polarizabilities, leading to contributions that depend on both the trace and the anisotropy of the pair-polarizability tensor. The short-range contribution of the anisotropic part to the pair polarizabilities has previously been obtained empirically from l
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10. Are helionitronium trications stable?
In a recent article [Olah, G. A., Prakash, G. K. S. & Rasul, G. (1999) Proc. Natl. Acad. Sci. USA 96, 3494–3495] the authors found that the helionitronium trication, HeNO\documentclass[10pt]{article} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{pmc} \usepackage
National Academy of Sciences.