General model of depolarization and transfer of polarization of singly ionized atoms by collisions with hydrogen atoms

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@Article{Derouich:2017:NA,
  author =       "M. Derouich",
  title =        "General model of depolarization and transfer of
                 polarization of singly ionized atoms by collisions with
                 hydrogen atoms",
  journal =      "New Astronomy",
  volume =       "51",
  pages =        "32--36",
  year =         "2017",
  ISSN =         "1384-1076",
  DOI =          "doi:10.1016/j.newast.2016.08.011",
  URL =          "http://www.sciencedirect.com/science/article/pii/S1384107616300756",
  abstract =     "Simulations of the generation of the atomic
                 polarization is necessary for interpreting the second
                 solar spectrum. For this purpose, it is important to
                 rigorously determine the effects of the isotropic
                 collisions with neutral hydrogen on the atomic
                 polarization of the neutral atoms, ionized atoms and
                 molecules. Our aim is to treat in generality the
                 problem of depolarizing isotropic collisions between
                 singly ionized atoms and neutral hydrogen in its ground
                 state. Using our numerical code, we computed the
                 collisional depolarization rates of the p-levels of
                 ions for large number of values of the effective
                 principal quantum number n* and the Unsoeld energy Ep.
                 Then, genetic programming has been used to fit the
                 available depolarization rates. As a result, strongly
                 non-linear relationships between the collisional
                 depolarization rates, n* and Ep are obtained, and are
                 shown to reproduce the original data with accuracy
                 clearly better than 10percent. These relationships
                 allow quick calculations of the depolarizing
                 collisional rates of any simple ion which is very
                 useful for the solar physics community. In addition,
                 the depolarization rates associated to the complex ions
                 and to the hyperfine levels can be easily derived from
                 our results. In this work we have shown that by using
                 powerful numerical approach and our collisional method,
                 general model giving the depolarization of the ions can
                 be obtained to be exploited for solar applications.",
  keywords =     "genetic algorithms, genetic programming, Scattering -
                 Sun, photosphere - atomic processes - line, formation -
                 line, profiles - polarization",
}

Genetic Programming entries for Moncef Derouich

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