APPLICATION OF THE GAUSSIAN TIME-DEPENDENT HARTREE METHOD TO THE STUDY OF THE GROUND STATE OF NEON CLUSTERS.

The ground state properties of neon clusters are studied through the Gaussian Time-Dependent Hartree (G-TDH) method. The presence of significant quantum effects in these systems poses a significant challenge to its theoretical investigation, because it drastically reduces the number of atoms that ca...

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Publicado en:Revista Cubana de Física Vol. 34; no. 1; pp. 23 - 27
Autores principales: RAMOS-RAMOS, A. R., URANGA-PIÑA, L., MARTÍNEZ-MESA, A.
Formato: Artículo
Publicado: Universidad de La Habana 2017
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Acceso en línea:Ver este registro en EBSCOhost
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        atl: APPLICATION OF THE GAUSSIAN TIME-DEPENDENT HARTREE METHOD TO THE STUDY OF THE GROUND STATE OF NEON CLUSTERS.
      aug:
        au:
          RAMOS-RAMOS, A. R.
          URANGA-PIÑA, L.
          MARTÍNEZ-MESA, A.
        affil: DynAMoS (Dynamical processes in Atomic and Molecular Systems), Faculty of Physics, University of Havana, Cuba
      su:
        Neon
        Microclusters
        Gaussian processes
        Hartree-Fock approximation
        Time-dependent density functional theory
        Quantum mechanics
      sug:
        subj:
          Neon
          Microclusters
          Gaussian processes
          Hartree-Fock approximation
          Time-dependent density functional theory
          Quantum mechanics
      ab:
        The ground state properties of neon clusters are studied through the Gaussian Time-Dependent Hartree (G-TDH) method. The presence of significant quantum effects in these systems poses a significant challenge to its theoretical investigation, because it drastically reduces the number of atoms that can be simulated in a computer. The application of the G-TDH method alleviates this difficulty, and it allows to study the ground state properties as a function of cluster size without neglecting the quantum effects. The method is based on the construction of an approximate wavefunction for the whole system, consisting in a Hartree product of normalized single-particle wavepackets of Gaussian shape. These Gaussian functions are characterized by their widths, and their centroids in position and momentum spaces. Using the Dirac-Frenkel-McLachlan variational principle and the imaginary-time propagation technique, we obtain the equations of motion that describe how these parameters approach the values that better describe the ground state of the system, and they enable to synthesize the system wavef unction of the system and to compute the structural and energetic properties of the cluster in the ground state.
        Se estudian las propiedades del estado básico de düsteres de neón mediante la aplicación del método de Hartree dependiente del tiempo utilizando paquetes de onda gaussianos (G-TDH, por sus siglas en inglés). La presencia de efectos cuánticos significativos en estos sistemas representa un importante desafío para las investigaciones teóricas, debido a que reduce drásticamente el número de átomos que pueden ser simulados en una computadora. La aplicación del método G-TDH permite reducir el costo computacional y estudiar las propiedades del estado básico como función del tamaño del cluster sin despreciar los efectos cuánticos. El método se basa en la construcción de una función de onda aproximada para el sistema, que consiste en un producto de Hartree de paquetes de onda un ?particulares con forma gaussiana. Estas funciones gaussianas se caracterizan por sus anchos y por sus centroides en los espacios de las coordenadas y de los momentos. Utilizando el principio variacional de Dirac-Frenkel-McLachlan y la técnica de propagación en tiempo imaginario, se obtienen las ecuaciones de movimiento que describen cómo estos parámetros se aproximan a los valores que describen el estado básico del sistema. Estos permiten obtener la función de onda del sistema y calcular las propiedades estructurales y energéticas del cluster en el estado básico.
      pubtype: Academic Journal
      doctype: Article
      src: R
    language: English
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