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The effect of an homogeneous magnetic field on the line profiles of hydrogen; Effet d'un champ magnetique uniforme sur les profils des raies de l'hydrogene

Abstract

The profiles of the hydrogen lines have been calculated taking into account the intermolecular electric field, the electronic collisions, and an external homogeneous magnetic field in which the plasma is imbedded. We considered electron densities N within the range 10{sup 15} {<=} N {<=} 10{sup 18} cm{sup -3} and magnetic field strengths < 1,2 10{sup 5} gauss. These values cover practically most of the experimental conditions in which one is interested in the present state of research. In the present paper we only present the numerical results for the lines Ly-{alpha}, Ly-{beta} and H-{alpha}. For very small magnetic fields our calculated line profiles coincide with the pure Stark profiles recently calculated by GRIEM, KOLB and SHEN (1960). With increasing magnetic fields, important deviations appear. The essential parameters for these deviations are, firstly: the direction of observation with regard to the direction of the magnetic field, and secondly: the ratio between the Zeeman splitting in a magnetic field only and the Stark splitting due to the mean intermolecular electric field. Experimental line profiles have been obtained using a linear discharge tube surrounded by an induction coil, the comparison of tie theoretical profiles with the experimental ones shows a satisfying agreement. The  More>>
Authors:
Nguyen, H; Herman, L; [1]  Drawin, H W [2] 
  1. Universite de Paris Sorbonne, Lab. de Recherche Physique, 75 - Paris (France)
  2. Association Euratom-CEA, Centre d'Etudes Nucleaires de Fontenay-aux-Roses, 92 (France)
Publication Date:
Jul 01, 1966
Product Type:
Technical Report
Report Number:
CEA-R-3057
Resource Relation:
Other Information: 18 refs; PBD: 1966
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ELECTRON COLLISIONS; HYDROGEN; LINE WIDTHS; MAGNETIC FIELDS; PLASMA; STARK EFFECT; ZEEMAN EFFECT
OSTI ID:
20621985
Research Organizations:
Commissariat a l'Energie Atomique, Fontenay-aux-Roses (France). Centre d'Etudes Nucleaires
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR05R3057065636
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
[72] pages
Announcement Date:

Citation Formats

Nguyen, H, Herman, L, and Drawin, H W. The effect of an homogeneous magnetic field on the line profiles of hydrogen; Effet d'un champ magnetique uniforme sur les profils des raies de l'hydrogene. France: N. p., 1966. Web.
Nguyen, H, Herman, L, & Drawin, H W. The effect of an homogeneous magnetic field on the line profiles of hydrogen; Effet d'un champ magnetique uniforme sur les profils des raies de l'hydrogene. France.
Nguyen, H, Herman, L, and Drawin, H W. 1966. "The effect of an homogeneous magnetic field on the line profiles of hydrogen; Effet d'un champ magnetique uniforme sur les profils des raies de l'hydrogene." France.
@misc{etde_20621985,
title = {The effect of an homogeneous magnetic field on the line profiles of hydrogen; Effet d'un champ magnetique uniforme sur les profils des raies de l'hydrogene}
author = {Nguyen, H, Herman, L, and Drawin, H W}
abstractNote = {The profiles of the hydrogen lines have been calculated taking into account the intermolecular electric field, the electronic collisions, and an external homogeneous magnetic field in which the plasma is imbedded. We considered electron densities N within the range 10{sup 15} {<=} N {<=} 10{sup 18} cm{sup -3} and magnetic field strengths < 1,2 10{sup 5} gauss. These values cover practically most of the experimental conditions in which one is interested in the present state of research. In the present paper we only present the numerical results for the lines Ly-{alpha}, Ly-{beta} and H-{alpha}. For very small magnetic fields our calculated line profiles coincide with the pure Stark profiles recently calculated by GRIEM, KOLB and SHEN (1960). With increasing magnetic fields, important deviations appear. The essential parameters for these deviations are, firstly: the direction of observation with regard to the direction of the magnetic field, and secondly: the ratio between the Zeeman splitting in a magnetic field only and the Stark splitting due to the mean intermolecular electric field. Experimental line profiles have been obtained using a linear discharge tube surrounded by an induction coil, the comparison of tie theoretical profiles with the experimental ones shows a satisfying agreement. The results for the lines originating from higher principal quantum numbers are actually exploited and will be communicated soon. (author) [French] Les profils des raies de l'hydrogene ont ete calcules en tenant compte des collisions electroniques, du champ electrique intermoleculaire et d'un champ magnetique uniforme exterieur. Nous avons considere des concentrations electroniques comprises entre 10{sup 15} cm{sup -3} et 10{sup 18} cm{sup -3} et des champs magnetiques inferieurs ou egaux a 1,2 10{sup 5} gauss. Ces valeurs couvrent pratiquement toutes les conditions experimentales qui ont un interet a l'heure actuelle. Dans le present travail, nous ne donnons que des resultats numeriques partiels concernant les raies Ly{alpha}, Ly{beta} et H{alpha}. Pour de tres faibles champs magnetiques, les profils que nous avons obtenus se confondent avec les profils de STARK purs, precedemment calcules par GRIEM, KOLB et SHEN (1960). Au fur et a mesure que le champ magnetique augmente, d'importants ecarts apparaissent. Les parametres caracteristiques essentiels de ces ecarts sont, d'une part, l'orientation de la direction d'observation par rapport a celle du champ magnetique, et d'autre part le rapport entre le deplacement ZEEMAN du au champ magnetique seul et le deplacement STARK du au champ electrique intermoleculaire moyen. L'etude experimentale a ete faite au moyen d'un tube a decharge entoure d'une bobine d'induction. La comparaison entre les profils theoriques et les resultats de mesure montre que la concordance est tres satisfaisante. Les resultats concernant les nombres quantiques principaux plus eleves sont en cours d'exploitation et feront partie d'une prochaine communication. (auteur)}
place = {France}
year = {1966}
month = {Jul}
}