Physics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........42d&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF CALIFORNIA, DAVIS, 1992.Source: Dissertation Abstracts International, Volume: 53-06, Section: B, p
Physics
1
Plasmas, Argon, Xenon
Scientific paper
Dielectronic Recombination is an important electron -ion recombination process which affects many aspects of plasmas. This work presents experimental measurements of relative dielectronic recombination cross sections for three highly charged ions: hydrogenlike argon (Ar ^{17+}), heliumlike argon (Ar ^{16+}), and neonlike xenon (Xe ^{44+}). The dielectronic recombination cross sections are compared to theoretical resonance strengths. Excellent agreement is found overall. The energy resolution of the experimental measurements is 18 eV FWHM. These experiments make use of the ion extraction system recently installed on the Electron Beam Ion Trap (EBIT). With this technique the interactions are measured through measurement of relative ion populations rather than relative x-ray intensities. Following a general introduction an overview of the theory of dielectronic recombination is presented which includes the calculation of the rate coefficient, the effects of dielectronic recombination on relative ion populations, and the relationship between the rate coefficient and the cross sections and resonance strengths. Both relativistic and nonrelativistic aspects of the theory are discussed and a sketch of the Multiconfiguration Dirac Fock (MCDF) method used to obtain theoretical cross sections is given. The Electron Beam Ion Trap (EBIT) is described in detail. Relations between the important operating parameters, such as the depth of the potential well and the electron beam current, are discussed. The ion extraction system is described. Physical processes which affect the populations of ions in the trap are discussed including evaporative cooling. The general rate equations for the time development of the ion populations are presented. The separate experiments for the three ions Ar ^{17+}, Ar^ {16+}, and Xe^{44+ } are then examined in detail. The KLL, KLM, KLN, KLO and KLP groups of resonances of hydogenlike argon as well as the LMM, LMN, LMO, LMP and LMQ groups of resonances of neonlike xenon are studied by observing the decay of the ion populations as recombination takes place. An estimate of the effective electron beam density is obtained with this technique. The KLL, KLM, KLN and KLO resonance groups of heliumlike argon are studied by obtaining the equilibrium ratio of heliumlike to lithiumlike argon ions and normalizing with a theoretical electron impact ionization cross section.
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