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AbstractAbstract
[en] The basic ideas of the model microfield method are shortly reviewed. Recent applications to the broadening of the alkali metal resonance lines, of hydrogen lines and of overlapping helium lines are presented. Some approximations are discussed with special emphasis on the problem of the ion dynamics
[fr]
Les idees de base de la methode du microchamp modele sont brievement rappelees. Des applications recentes a l'elargissement des raies de resonance des metaux alcalins, de l'hydrogene et des raies d'helium a composante interdite sont presentees. On discute de quelques approximations en mettant particulierement l'accent sur le probleme de la dynamique des ionsOriginal Title
Methode du microchamp modele. Applications recentes a l'elargissement Stark des raies d'atomes neutres
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Source
Colloquium on the influence of the collisional processes on the spectral line profiles; Orleans, France; 4 - 5 Sep 1979
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Journal Article
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Conference
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Annales de Physique (Paris); ISSN 0003-4169;
; v. 5(4); p. 219-226

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Voslamber, D.
Association Euratom-CEA sur la Fusion, Centre d'Etudes Nucleaires de Fontenay-aux-Roses, 92 (France). Dept. de Physique du Plasma et de la Fusion Controlee1979
Association Euratom-CEA sur la Fusion, Centre d'Etudes Nucleaires de Fontenay-aux-Roses, 92 (France). Dept. de Physique du Plasma et de la Fusion Controlee1979
AbstractAbstract
[en] Before looking at this problem more closely, it is worth observing that the idea of 'ion dynamics', although corresponding to the international jargon, is in fact doubly improper. 1) Not only is it a question of ion dynamics but also that of active atoms. In point of fact it is a question of the effect of the relative velocity between active atoms and disturbing ions. 2) It is not a question of the ions themselves but rather of the 'low frequency component of the plasma microfield' which is approximately the field of the ions surrounded by screen clouds formed by the electrons. In brief, it is a question of the time variation of the low frequency component of the microfield felt by the active atom in its own mark. From these observations, it will be seen that the problem of ion dynamics is linked to other phenomena. The phenomenon referred to in (1) above brings about coupling between Stark effect broadening and Doppler effect broadening. The separation of these two effects by deconvolution of the two corresponding profiles therefore constitutes an approximation. The phenomenon mentioned in (2) shows there is coupling between 'ion dynamics' and the interactions between the charged particles of the plasma. The diagram plotted during the presentation of this paper shows how an approximate decorrelation can be reached
[fr]
Avant de considerer ce probleme de plus pres, il convient de remarquer que la notion de la 'dynamique des ions' bien que correspondant au jargon international, est en fait doublement abusive. 1) Il ne s'agit pas seulement de la dynamique des ions mais aussi de celle des atomes actifs; en fait il s'agit des effets de la vitesse relative entre atomes actifs et ions perturbateurs. 2) Il ne s'agit pas des ions proprement dits, mais de la 'composante de basse frequence du microchamp du plasma' qui est approximativement le champ des ions entoures de nuages d'ecran constitues par les electrons. Pour resumer, il s'agit de la variation temporelle de la composante de basse frequence du microchamp ressenti par l'atome actif dans son propre repere. On voit, a partir de ces remarques, que le probleme de la 'dynamique des ions' est couple a d'autres phenomenes. Le phenomene mentionne sous (1) entraine un couplage entre l'elargissement par effet Stark et l'elargissement par effet Doppler. La separation des deux effets moyennant une deconvolution des deux profils correspondants constitue donc une approximation. Le phenomene mentionne sous (2) temoigne d'un couplage entre la 'dynamique des ions' et les interactions entre les particules chargees du plasma. Le schema trace au cours de cet expose montre comment on peut arriver a une decorrelation approximativeOriginal Title
Le probleme de la dynamique des ions dans l'elargissement Stark
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1979; 19 p; Colloquium on the effects of collision processes on spectral line profiles; Orleans, France; 4 - 6 Sep 1979
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Report
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Conference
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AbstractAbstract
No abstract available
Original Title
Autoalargamento de linhas de inversao da amonia
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32. Annual Meeting of the Brazilian Society for the Advancement of Science; Rio de Janeiro, Brazil; 6 - 12 Jul 1980; Published in summary form only.
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Journal Article
Literature Type
Conference
Journal
Ciencia e Cultura; ISSN 0009-6725;
; v. 32(7); p. 241

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AbstractAbstract
[en] peak broadening, which depends markedly on the reflection indices, has been observed in high resolution neutron powder patterns. It is postulated that this is due to variations in some of the unit cell parameters. From the lines which remain narrow the cell parameters (or their combinations) which behave normally can be determined. The remaining parameters have been allowed a range of values, and the resulting contribution to the peak width has been calculated. This has been combined with the normal width function of a Rietveld refinement and excellent agreement with the observed neutron patterns has been obtained. The analysis is illustrated by data from RbOD at room temperature and α-PbO. (author) 10 refs., 2 fig., 1 tab
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AbstractAbstract
[en] Combined effect of homogeneous broadening conditioned by random character of the molecule nucleus movement, and inhomogeneous sequential broadening on the formation of separate bands of free multiatom molecule electron-oscillative spectra is investigated. Homogeneous and inhomogeneous broadening width dependence on the temperature and number of thermal tank oscillators disturbing oscillators active in the optical transition is investigated
Original Title
Sootnoshenie odnorodnogo i neodnorodnogo ushireniya polos ehlektronno-kolebatel'nykh spektrov svobodnykh mnogoatomnykh molekul
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AbstractAbstract
[en] Using a model method of loss energy simulation on the boundary surfaces, temperature and composition of an electrodynamic macroparticle accelerator arc plasma created by the evaporation of a Cu foil, have been calculated. Stark widths for Cu VI lines of interest for the arc plasma diagnostic have been calculated also, by using the modified semiempirical method
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International Conference on the physics of multiply charged ions and International workshop on E.C.R. ion sources; Grenoble (France); 12-16 Sep 1988
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Journal Article
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Conference
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Journal de Physique (Les Ulis), Colloque; ISSN 0449-1947;
; CODEN JPQCA; v. 50(C.1); p. C1.623-C1.628

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AbstractAbstract
[en] In this work we study the effects of the cylindrical differential rotation upon the determination of the V sin i parameter. We show that the width of a line broadened by a cylindrical differential rotation may correspond to two different values of the V sin i parameter
[fr]
Dans ce travail nous etudions les effets de la rotation differentielle cylindrique sur la determination du parametre V sin i des etoiles. Nous montrons que la largeur d'une raie elargie par la rotation differentielle cylindrique peut correspondre a deux valeurs differentes du parametre V sin iOriginal Title
Le parametre V sin i des etoiles et la rotation differentielle cylindrique
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Journal Article
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Comptes Rendus des Seances de l'Academie des Sciences. Serie 2; ISSN 0249-6305;
; CODEN CRSUD; v. 306(17); p. 1225-1230

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AbstractAbstract
[en] The Stark broadening of the line ArI 13406,6 A (3d-4f) was measured in an argon plasma with an impurity of hidrogen. The plasma was a pulsed linear discharge 25 cm long, 5 cm in diameter and operated at a charging voltage of 6 KV with a peak current of 20 KA. The profiles were measured in a shoot to shoot basis using a 75 cm monochromator provided with an InSb detector operated at liquid nitrogen temperatures. The Stark broadening of the Balmer beta line (HB) of hydrogen was used for determination of the electron densities, which ranged from 7 x 1015 to 2 x 1016 cm-3. The Saha equations were used to obtain the electron temperatures, which ranged from 1.2 x 104 to 3.0 x 104 K. The results are compared with a semiclassical calculation for the width of the line
Original Title
Medicion del ensanchamiento Stark de la linea 13406,6 A de Argon neutro en plasmas
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Journal Article
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Acta Cientifica Venezolana; ISSN 0001-5504;
; v. 34(2); p. 84-88

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AbstractAbstract
[en] A physical discussion of the validity conditions of the different approximations allows to compare the Model Microfield Method (MMM) which takes into account the collective dynamical effects resulting from simultaneous collisions and the impact approximation valid for weak or strong non overlapping collisions. Neglecting the level splitting effects, the profile of Lyman and Balmer lines is Lorentzian in the line centre and an analytical formula for the width is given. Then, fine structure and radiative lifetime effects are analysed
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Secondary Subject
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Journal Article
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Annales de Physique (Paris); ISSN 0003-4169;
; v. 9(4); p. 697-704

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AbstractAbstract
No abstract available
Original Title
Localisation experimentale d'une raie satellite sur l'aile rouge de la raie Lyman α elargie par un plasma
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Journal Article
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Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences. Serie B; v. 279(26); p. 649-652
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