Line broadening by hot and dense plasmas
This study is devoted to the broadening of hydrogenic x-ray lines emitted by plasmas produced by laser impact or implosion. In addition to the traditional broadening processes due to high- and low-frequency components of the electric microfield, we have examined the influence of the self-generated magnetic field B correlated with the Doppler effect by the motional electric field E/sub m/ = V/sub E/ x B/c. For the interaction between plasma electrons and radiating ions with high charge number Z/sub E/, fully quantum-mechanical results (Phys. Rev. A 19, 2421 (1979)) have been used to include all multipole orders of the Coulomb interaction. An analytical treatment of the combined effect of the ion microfield and the self-generated magnetic field shows clearly that the latter is quite important. Its influence consists principally in giving the line profiles a sensitive dependence on polarization and the observation direction k. In case of the C VI resonance line emitted from a plasma corresponding to the critical density in glass laser experiments and a magnetic field of about 10 MG, the profiles are considerably broader than those deduced from only the particle fields. In addition, the profiles observed parallel to the magnetic field (kparallelB) may show a central dip which cannot be ignored in a quantitative study of the line absorption properties.
- Research Organization:
- Laboratoire de Spectroscopie Atomique des Plasmas, D. R. P., L. A. N 71, Universite P. et M. Curie, 4, Place Jussieu, 75230 Paris Cedex 05, France
- OSTI ID:
- 6423624
- Journal Information:
- Phys. Rev. A; (United States), Vol. 24:1
- Country of Publication:
- United States
- Language:
- English
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