Mostrar el registro sencillo del ítem
dc.contributor.author
Rohrmann, Rene Daniel
dc.date.available
2018-10-26T20:14:45Z
dc.date.issued
2018-01
dc.identifier.citation
Rohrmann, Rene Daniel; Rayleigh scattering in dense fluid helium; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 473; 1; 1-2018; 457-469
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/63141
dc.description.abstract
Iglesias et al. showed that the Rayleigh scattering from helium atoms decreases by collective effects in the atmospheres of cool white dwarf stars. Their study is here extended to consider an accurate evaluation of the atomic polarizability and the density effects involved in the Rayleigh cross-section over a wide density-temperature region. The dynamic dipole polarizability of helium atoms in the ground state is determinated with the oscillator-strength distribution approach. The spectral density of oscillator strength considered includes most significant single and doubly excited transitions to discrete and continuum energies. Static and dynamic polarizability results are confronted with experiments and other theoretical evaluations shown a very good agreement. In addition, the refractive index of helium is evaluated with the Lorentz- Lorenz equation and shows a satisfactory agreement with the most recent experiments. The effect of spatial correlation of atoms on the Rayleigh scattering is calculated with Monte Carlo simulations and effective energy potentials that represent the particle interactions, covering fluid densities between 0.005 and a few g cm-3 and temperatures between 1 000 and 15 000 K. We provide analytical fits from which the Rayleigh cross-section of fluid helium can be easily calculated at wavelength λ > 505.35 Å. Collision-induced light scattering was estimated to be the dominant scattering process at densities greater than 1-2 g cm-3 depending on the temperature.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Oxford University Press
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Atomic Processes
dc.subject
Opacity
dc.subject
Scattering
dc.subject.classification
Astronomía
dc.subject.classification
Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Rayleigh scattering in dense fluid helium
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-10-22T17:27:55Z
dc.journal.volume
473
dc.journal.number
1
dc.journal.pagination
457-469
dc.journal.pais
Reino Unido
dc.journal.ciudad
Oxford
dc.description.fil
Fil: Rohrmann, Rene Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina
dc.journal.title
Monthly Notices of the Royal Astronomical Society
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/stx2440
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article-abstract/473/1/457/4222615
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1709.07076
Archivos asociados