Author name code: vanregemorter
ADS astronomy entries on 2022-09-14
author:"van Regemorter, H." 
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Title: The ``on the energy shell'' simplification of the impulse
    approximation in Rydberg atom-neutral collisions
Authors: Hoang-Binh, D.; van Regemorter, H.
Bibcode: 1999AIPC..467..336H
Altcode: 1999sls..conf..336H
  Three types of calculations are compared according to the approximations
  used for the (e+B) scattering amplitude fe(q--&gt;q<SUP>'</SUP>):
  (i) Exact impulse approximation (without any further approximation);
  (ii) Impulse approximation+``on the energy shell'' approximation; (iii)
  Impulse approximation+``on the energy shell'' approximation+``scattering
  length'' approximation. Preliminary results have been obtained for
  Na(n,l)+Ar collisions, suggesting that the ``on the energy shell''
  approximation breaks down for large momentum transfers Q.

Title: On the Ion Broadening of the 12 MU M lines of Atomic Magnesium
Authors: Hoang-Binh, D.; van Regemorter, H.
Bibcode: 1994IAUS..154..353H
Altcode:
  No abstract at ADS

Title: Stark broadening theory of solar Rydberg lines in the
    far-infrared spectrum
Authors: van Regemorter, H.; Hoang-Binh, D.
Bibcode: 1993A&A...277..623V
Altcode:
  Line broadening theory is revisited to obtain simple formulae,
  in the specific case of isolated lines, resulting from transitions
  between nearly degenerate states of atomic magnesium. Both the widths
  and shifts, due to collisions with electrons and positive ions,
  are obtained without any elaborate calculations for all the Rydberg
  lines (n‧, l‧) → (n,l‧+1), (5≤n‧≤ 1O n‧≤n&lt;11,
  l&gt;3), listed by Jefferies (1991). Validity conditions of the
  formulae are given for all the transitions under study. <P />It is
  shown that inelastic weak collisions usually dominate the widths,
  and that adiabatic ion collisions always dominate the shifts and thus
  determine their signs. The shifts appear as good diagnostics; e.g. for
  the peculiar case of the 6h-7i line near 12 μm, good agreement with
  observations is obtained for electron and ion densities close to those
  in the line forming region.

Title: Electron-Ion Processes in Hot Plasmas
Authors: Dubau, J.; van Regemorter, H.
Bibcode: 1983aia..conf..221D
Altcode:
  The authors discuss atomic processes in plasmas such as coronal
  and Tokamak plasmas with temperatures above 10<SUP>6</SUP>K
  and electron densities N<SUB>e</SUB> very low 10<SUP>15</SUP>
  cm<SUP>-3</SUP>. Ion-electron processes are the most important
  mechanisms for populating the emitting levels. Emphasis is put on
  the use of a distorted-wave approximation which gives a reliable
  representation of the electron-ion system. The validity of approximate
  methods derived from perturbation theory for highly charged ions is
  also discussed.

Title: Atoms in Astrophysical Plasmas
Authors: van Regemorter, H.
Bibcode: 1982ASIB...71..233V
Altcode: 1982amct.conf..233V
  No abstract at ADS

Title: The calculation of oscillator strengths and multipole radial
    integrals in the Coulomb approximation.
Authors: Binh, D. H.; Prudhomme, M.; van Regemorter, H.
Bibcode: 1979ApJ...230L.127B
Altcode:
  A very simple method is presented which yields accurate values
  of multipole radial integrals in the Coulomb approximation, even
  for transitions involving high Rydberg states. It is noted that the
  smallest of the effective quantum numbers can be as large as 200. The
  previously described approach is briefly outlined with a slightly more
  general formulation applicable to any multipole transition in any ion
  with a specified net charge. A recurrence relation is pointed out which
  makes the calculation of the Gordon (1929) formula quite rapid and easy.

Title: Molecular formation and destruction in the interstellar medium.
Authors: van Regemorter, H.; Giusti Suzor, A.; Roueff, E.
Bibcode: 1979atph.conf.....V
Altcode:
  No abstract at ADS

Title: A new calculation of the radiative association rate of the
CH<SUP>+</SUP> radical: comparison between semiclassical and quantal
    results (interstellar abundance)
Authors: Giusti-Suzor, A.; Roueff, E.; van Regemorter, H.
Bibcode: 1976JPhB....9.1021G
Altcode:
  No abstract at ADS

Title: On simple quantum theories of pressure broadening: the exact
    resonance approximation applied to Lyman alpha.
Authors: Tran Minh, N.; Feautrier, N.; van Regemorter, H.
Bibcode: 1976JQSRT..16..849T
Altcode:
  No abstract at ADS

Title: Negative ion formation by radiative electron attachment
    on atoms.
Authors: Janev, R. K.; van Regemorter, H.
Bibcode: 1974A&A....37....1J
Altcode:
  The problem of radiative electron attachment on atoms at thermal
  energies is considered. Analytical expressions both for reaction cross
  section and rate coefficient are obtained in closed form. The distortion
  of the electronic motion in the initial state due to the scattering
  effects by the long range part of the atomic potential is explicitly
  taken into account. The low temperature dependence of the reaction
  rate coefficient for electron capture into an s- or p-final state is
  discussed and explicit expressions of these coefficients are given
  for several cases of special astrophysical and aeronomical interest.

Title: Fundamental spectroscopic data (Données spectroscopiques
    fondamentales).
Authors: Cook, A. H.; Edlén, B.; Kessler, K. G.; Garstang, R. H.;
   van Regemorter, H.; Moore-Sitterly, C.; Phillips, J. G.
Bibcode: 1973IAUTA..15..155C
Altcode:
  No abstract at ADS

Title: Spectral Line Broadening
Authors: van Regemorter, H.
Bibcode: 1972ama..conf...85V
Altcode:
  No abstract at ADS

Title: The Broadening by Neutral Hydrogen in the Solar Atmosphere
Authors: Roueff, E.; van Regemorter, H.
Bibcode: 1971A&A....12..317R
Altcode:
  The broadening cannot be given by the van der Waals interaction,
  increasing the C. constant arbitrarily, as it is assumed in a recent
  paper by Holweger (1971). Key words: atomic physics - spectral line
  broadening - interatomic potential

Title: Collisional Broadening of Spectral Lines Applications in
    Astrophysics and Plasma Physics
Authors: van Regemorter, H.
Bibcode: 1971peac.conf..897V
Altcode:
  No abstract at ADS

Title: Pressure Broadening of UV Lines
Authors: van Regemorter, H.
Bibcode: 1971HiA.....2..561V
Altcode:
  No abstract at ADS

Title: Pressure broadening of UV lines.
Authors: van Regemorter, H.
Bibcode: 1971adiu.conf..561V
Altcode:
  No abstract at ADS

Title: Excitation and Ionization by Electron Impact
Authors: Bely, Oleg; van Regemorter, Henri
Bibcode: 1970ARA&A...8..329B
Altcode:
  No abstract at ADS

Title: Spectral Line Broadening due to Atomic Collisions
Authors: Roueff, E.; van Regemorter, H.
Bibcode: 1969A&A.....1...69R
Altcode:
  The width of spectral lines due to collisions with hydrogen atoms
  does not rise from the Van der Waals dispersion forces but from a
  shorter interaction.

Title: Sur les raies de l'hydrogène. II. Importance respective des
    domaines &lt;&lt; impact &gt;&gt; et quasistatique pour les électrons
Authors: Feautrier, N.; Praderie, F.; van Regemorter, H.
Bibcode: 1967AnAp...30...45F
Altcode:
  No abstract at ADS

Title: Spectral Line Broadening
Authors: van Regemorter, Henri
Bibcode: 1965ARA&A...3...71V
Altcode:
  No abstract at ADS

Title: L'éllargissement des raies spectrales par chocs
Authors: Bréchot, S.; van Regemorter, H.
Bibcode: 1964AnAp...27..432B
Altcode:
  No abstract at ADS

Title: L'élargissement des raies spectrales par chocs. II. -
    Théorie gélnélrale de l'éllargissement par chocs éllectroniques
Authors: Bréchot, Sylvie; van Regemorter, Henri
Bibcode: 1964AnAp...27..739B
Altcode:
  No abstract at ADS

Title: Rate of Collisional Excitation in Stellar Atmospheres.
Authors: van Regemorter, Henri
Bibcode: 1962ApJ...136..906V
Altcode:
  An approximate formula is proposed to compute the cross-section for
  excitation by electron impact for the optically allowed transitions
  in neutral atoms and in positive ions. Comparison is given with the
  semiclassical formula of Woolley and Allen. Tables are given of the
  rate of collisional de-excitation in the main-sequence stars.

Title: Méthodes de calcul des sections d'excitation par chocs
    électroniques
Authors: van Regemorter, H.
Bibcode: 1960AnAp...23..817V
Altcode:
  No abstract at ADS

Title: Electron impact excitation of positive ions: application to
    Ca+ 4s - 4p and 3d-4p
Authors: van Regemorter, H.
Bibcode: 1960MNRAS.121..213V
Altcode:
  A review is given of different approximate methods for computing
  cross sections for transitions in positive ions produced by electron
  impact. It is shown that it Is necessary to take into account
  the distortion by the ion field, and, for strong optically allowed
  transitions, one must allow for strong coupling effects. Application
  to the 4p and 4p - 3d transitions in singly ionized calcium shows
  that the neglect of strong coupling effects overestimates the cross
  sections. However, our results, computed with a Coulomb distorted wave
  approximation, with allowance for strong coupling effects, are much
  bigger than those of Jefferies, the reason being that he considered only
  one value (1 = i) of the angular momentum of the incident electron,
  whereas the main contribution is shown to occur for 1=4. The Bethe
  approximation, with allowance for Coulomb distortion, implies in fact
  two different approximations: the weak coupling approximation and the
  "long range approximation ". It is possible to make corrections for
  strong coupling effects and, for strong allowed transitions such as
  4s - 4p and 4p - 3d in Ca+, this method gives good results in a very
  simple way.

Title: Recherches sur les problèmes théoriques de classification:
    II. Le calcul des raies d'absorption dans les spectres stellaires
Authors: van Regemorter, H.
Bibcode: 1959AnAp...22..341V
Altcode:
  No abstract at ADS

Title: Recherches sur les problèmes théoriques de classification:
    I. Les courbes de croissance dans la théories du transfert radiatif
Authors: van Regemorter, H.
Bibcode: 1959AnAp...22..249V
Altcode:
  No abstract at ADS

Title: Recherches sur les problèmes théoriques de classification
    stellaire IV. Applications aux problèmes de classification
Authors: van Regemorter, H.
Bibcode: 1959AnAp...22..681V
Altcode:
  No abstract at ADS

Title: Recherches sur les problèmes théoriques de classification:
    III. L'élargissement des raies de l'hydrogène
Authors: van Regemorter, H.
Bibcode: 1959AnAp...22..363V
Altcode:
  No abstract at ADS

Title: La mesure de la largeur équivalente d'une raie
    spectrale. L'influence du pouvoir de résolution
Authors: Pecker, Jean-Claude; van Regemorter, Henri
Bibcode: 1952AnAp...15..363P
Altcode:
  No abstract at ADS

