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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.
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-->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.
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Title: On the Ion Broadening of the 12 MU M lines of Atomic Magnesium
Authors: Hoang-Binh, D.; van Regemorter, H.
1994IAUS..154..353H Altcode:
No abstract at ADS
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Title: Stark broadening theory of solar Rydberg lines in the
far-infrared spectrum
Authors: van Regemorter, H.; Hoang-Binh, D.
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<11,
l>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.
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Title: Electron-Ion Processes in Hot Plasmas
Authors: Dubau, J.; van Regemorter, H.
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.
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Title: Atoms in Astrophysical Plasmas
Authors: van Regemorter, H.
1982ASIB...71..233V Altcode: 1982amct.conf..233V
No abstract at ADS
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Title: The calculation of oscillator strengths and multipole radial
integrals in the Coulomb approximation.
Authors: Binh, D. H.; Prudhomme, M.; van Regemorter, H.
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.
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Title: Molecular formation and destruction in the interstellar medium.
Authors: van Regemorter, H.; Giusti Suzor, A.; Roueff, E.
1979atph.conf.....V Altcode:
No abstract at ADS
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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.
1976JPhB....9.1021G Altcode:
No abstract at ADS
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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.
1976JQSRT..16..849T Altcode:
No abstract at ADS
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Title: Negative ion formation by radiative electron attachment
on atoms.
Authors: Janev, R. K.; van Regemorter, H.
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.
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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.
1973IAUTA..15..155C Altcode:
No abstract at ADS
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Title: Spectral Line Broadening
Authors: van Regemorter, H.
1972ama..conf...85V Altcode:
No abstract at ADS
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Title: The Broadening by Neutral Hydrogen in the Solar Atmosphere
Authors: Roueff, E.; van Regemorter, H.
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
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Title: Collisional Broadening of Spectral Lines Applications in
Astrophysics and Plasma Physics
Authors: van Regemorter, H.
1971peac.conf..897V Altcode:
No abstract at ADS
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Title: Pressure Broadening of UV Lines
Authors: van Regemorter, H.
1971HiA.....2..561V Altcode:
No abstract at ADS
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Title: Pressure broadening of UV lines.
Authors: van Regemorter, H.
1971adiu.conf..561V Altcode:
No abstract at ADS
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Title: Excitation and Ionization by Electron Impact
Authors: Bely, Oleg; van Regemorter, Henri
1970ARA&A...8..329B Altcode:
No abstract at ADS
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Title: Spectral Line Broadening due to Atomic Collisions
Authors: Roueff, E.; van Regemorter, H.
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.
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Title: Sur les raies de l'hydrogène. II. Importance respective des
domaines << impact >> et quasistatique pour les électrons
Authors: Feautrier, N.; Praderie, F.; van Regemorter, H.
1967AnAp...30...45F Altcode:
No abstract at ADS
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Title: Spectral Line Broadening
Authors: van Regemorter, Henri
1965ARA&A...3...71V Altcode:
No abstract at ADS
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Title: L'éllargissement des raies spectrales par chocs
Authors: Bréchot, S.; van Regemorter, H.
1964AnAp...27..432B Altcode:
No abstract at ADS
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Title: L'élargissement des raies spectrales par chocs. II. -
Théorie gélnélrale de l'éllargissement par chocs éllectroniques
Authors: Bréchot, Sylvie; van Regemorter, Henri
1964AnAp...27..739B Altcode:
No abstract at ADS
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Title: Rate of Collisional Excitation in Stellar Atmospheres.
Authors: van Regemorter, Henri
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.
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Title: Méthodes de calcul des sections d'excitation par chocs
électroniques
Authors: van Regemorter, H.
1960AnAp...23..817V Altcode:
No abstract at ADS
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Title: Electron impact excitation of positive ions: application to
Ca+ 4s - 4p and 3d-4p
Authors: van Regemorter, H.
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.
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Title: Recherches sur les problèmes théoriques de classification:
II. Le calcul des raies d'absorption dans les spectres stellaires
Authors: van Regemorter, H.
1959AnAp...22..341V Altcode:
No abstract at ADS
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Title: Recherches sur les problèmes théoriques de classification:
I. Les courbes de croissance dans la théories du transfert radiatif
Authors: van Regemorter, H.
1959AnAp...22..249V Altcode:
No abstract at ADS
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Title: Recherches sur les problèmes théoriques de classification
stellaire IV. Applications aux problèmes de classification
Authors: van Regemorter, H.
1959AnAp...22..681V Altcode:
No abstract at ADS
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Title: Recherches sur les problèmes théoriques de classification:
III. L'élargissement des raies de l'hydrogène
Authors: van Regemorter, H.
1959AnAp...22..363V Altcode:
No abstract at ADS
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Title: La mesure de la largeur équivalente d'une raie
spectrale. L'influence du pouvoir de résolution
Authors: Pecker, Jean-Claude; van Regemorter, Henri
1952AnAp...15..363P Altcode:
No abstract at ADS
