Ion quadrupole effects in spectral line broadening
Abstract
Line broadening is currently being used as a diagnostic tool for density determination in dense plasmas. The applicability of this tool could be improved through better understanding of line shifts and asymmetries. Most calculable line shape theories to date employ the dipole approximation to treat the interaction between the radiator and perturbing ions. That is, the interaction is given by vector P.vector E, where vector P is the emitter dipole moment and vector E is a uniform quasistatic microfield due to the perturbing ions. It was proposed that the next higher multipole in the radiator perturbing ion interaction, that is the quadrupole field gradient interaction, could be a significant source of asymmetry. A method to include the quadrupole interaction in line broadening theories and discuss some preliminary calculations is presented.
- Publication:
-
Presented at the 7th Intern. Conf. on Spectral Line Shapes
- Pub Date:
- 1984
- Bibcode:
- 1984sls..conf.....J
- Keywords:
-
- Emission Spectra;
- Plasma Density;
- Plasma Diagnostics;
- Quadrupoles;
- Argon;
- Electric Fields;
- Lyman Spectra;
- Perturbation;
- Probability Density Functions;
- Plasma Physics