Higher-order microfield effects on spectral-line broadening in dense plasmas
Radiating atoms in dense plasmas are highly affected by their local plasma environment. The author examines the effect of this environment on hydrogenic radiators by using an atomic wave function basis set that is itself a function of the plasma electric microfield for the calculation of spectral line profiles. His theoretical development includes the effect of static ion perturbers up to the quadrupole term in the multipole expansion of the radiator-perturbing ion interaction, as well as dynamic electron broadening up to second order in the radiator-perturbing electron interaction. Effects due to the presence of the uniform ion-electric field are treated exactly within this framework, and the field gradient is then treated as a perturbation by inclusion of the ion-quadrupole term. He employs a basis set for the representation of the upper state of the transition that includes states of principle quantum number n as well as n + 1 to allow for the field mixing of these two manifolds. The ion-quadrupole effect is treated in a new way that includes ion correlations by using a renormalized independent-particle model for the perturbing ions. He also presents a preliminary assessment of the importance of field ionization on the spectral line shapes. His results are compared with previously reported calculations using field independent matrix elements, neglect of possible field ionization and the independent-particle model of the ion-quadrupole effect. Hence, he is able to identify the most important effects that arise from the use of the field dependent basis set. These comparisons also allow him to examine the importance of ion correlations when determining the ion-quadrupole effect.
- Research Organization:
- Florida Univ., Gainesville, FL (United States)
- OSTI ID:
- 5188095
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effects of plasma microfields on radiative transitions from atomic levels above the ionization threshold
Ion quadrupole effects in spectral line broadening
Related Subjects
PLASMA
LINE BROADENING
ATOMS
ELECTRIC FIELDS
ELECTRONS
IONIZATION
IONS
PERTURBATION THEORY
QUANTUM NUMBERS
SPECTRA
WAVE FUNCTIONS
CHARGED PARTICLES
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
LEPTONS
700320* - Plasma Diagnostic Techniques & Instrumentation- (1992-)