Excited states of <sup>4</sup>He droplets
We study low-lying excited states of <sup>4</sup>He clusters up to a cluster size of 40 atoms in a variational framework. The ansatz wave function combines two- and three-body correlations, coming from a translationally invariant configuration interaction description, and Jastrow-type sh...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2001 |
| País: | Argentina |
| Institución: | Universidad Nacional de La Plata |
| Repositorio: | SEDICI (UNLP) |
| Idioma: | inglés |
| OAI Identifier: | oai:sedici.unlp.edu.ar:10915/104412 |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/104412 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias Exactas Física liquid and solid helium ground state and elementary excitations atomic and molecular clusters two and three body correlations |
| Sumario: | We study low-lying excited states of <sup>4</sup>He clusters up to a cluster size of 40 atoms in a variational framework. The ansatz wave function combines two- and three-body correlations, coming from a translationally invariant configuration interaction description, and Jastrow-type short-range correlation. We have previously used this scheme to determine the ground-state energies of <sup>4</sup>He and <sup>3</sup>He clusters. Here we present an extension of this ansatz wave function having a good quantum angular momentum L. The variational procedure is applied independently to the cases with L = 0,2,4, and upper bounds for the corresponding energies are thus obtained. Moreover, centroid energies for L excitations are calculated through the use of sum rules. A comparison with previous calculations is also made. |
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