Por favor, use este identificador para citar o enlazar este ítem:https://uvadoc.uva.es/handle/10324/56929
Título
Spectral line shapes of He I Line 3889 Å
Autor
Año del Documento
2014
Editorial
MDPI
Descripción
Producción Científica
Documento Fuente
Atoms, 2014, vol.2, n. 2, p. 277-298
Abstract
Spectral line shapes of neutral helium 3889 Å(23S–33P) transition line are calculated by using several theoretical methods. The electronic contribution to the line broadening is calculated from quantum statistical many-particle theory by using thermodynamic Green's function, including dynamic screening of the electron-atom interaction. The ionic contribution is taken into account in a quasistatic approximation, where a static microfield distribution function is presented. Strong electron collisions are consistently considered with an effective two-particle T-matrix approach, where Convergent Close Coupling method gives scattering amplitudes including Debye screening for neutral helium. Then the static profiles converted to dynamic profiles by using the Frequency Fluctuation Model. Furthermore, Molecular Dynamics simulations for interacting and independent particles are used where the dynamic sequence of microfield is taken into account. Plasma parameters are diagnosed and good agreements are shown by comparing our theoretical results with the recent experimental result of Jovićević et al. (J. Phys. B: At. Mol. Opt. Phys. 2005, 38, 1249). Additionally, comparison with various experimental data in a wide range of electron density ne ≈ (1022− 1024)m−3 and temperature T ≈ (2−6) × 104 K are presented.
Palabras Clave
Spectral line shapes
Green’s function
T-matrix
Molecular dynamics simulations
Plasma diagnostics
ISSN
2218-2004
Revisión por pares
SI
Version del Editor
Propietario de los Derechos
© 2014 The Author(s)
Idioma
eng
Tipo de versión
info:eu-repo/semantics/publishedVersion
Derechos
openAccess
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