Effet d'un champ magnetique uniforme sur les profils des raies de l'hydrogene

Electron density determination in the divertor volume of ASDEX Upgrade via Stark broadening of the Balmer lines

“…With the unified theory it is possible to combine the collision broadening by electrons with the Stark splitting (statistical theory) caused by the ions. In the Schrödinger equation the electron contribution is described with a collision operator [17] and the ion contribution via an interaction Hamiltonian H = e r · E (linear Stark effect). For the electric field strengths produced by the ions we used the Mozer-Baranger distribution function [18,19], which is based on the Holtsmark distribution function [20] and additionally accounts for Debye shielding and ion-ion interactions.…”

The Effect of a Magnetic Field on the Hβ Line Emission from a T‐Tube Plasma

“…In other words, the magnetic field was not frozen and pushed in front of the plasma. The contribution of the Zeeman effect can be estimated from the parameter T defined in [l] and [2], which gives the contribution of the Stark effect over the Zeeman effect. In all cases the Zeeman effect was found negligible and consequently, it cannot be responsible for the detected red-shift of the emitted lines.…”

Polarization of line radiation in the presence of external electric quadrupole and uniform magnetic fields

“…(6) come from l = 2 viz., the electric quadrupole interactions, provided I ¿ 1 and J ¿ 1 for the nuclear and atomic spins, as otherwise the respective quadrupole moments proportional to Q 2 (nuc) = I; I |Q 2; 0 (nuc)| I; I and Q 2 (atom) = J; J |Q 2; 0 (atom)| J; J vanish, due to the vanishing of the Clebsch-Gordan coe cients in Eqs. (10) and (11) in such a case. Since Q 2 (nuc)Q 2 (atom), we neglect the nuclear contribution and represent the l = 2 term in H int as a (2J + 1) × (2J + 1) matrix in atomic spin space with elements given by…”

“…The recent work in the use of line polarization as a diagnostic of ambient electric ÿelds in solar atmospheric features can be found in [9]. A rigorous formulation of the quantum problem of the hydrogen atom exposed to electric as well as magnetic ÿelds was presented by Casini and Landi Degl' Innocenti [5], widely generalizing the earlier work of Nguyen-Hoe et al [10]. They gave expressions for the Stokes proÿles emitted by a line transition using an earlier formalism [11], based on the density matrix concept.…”