Dielectronic recombination of highly charged ions using an electron beam ion trap

Miscellaneous · Wed Jan 01 00:00:00 EST 1992

OSTI ID:7014874

DeWitt, D R

This work presents experimental measurements of relative dielectronic recombination cross sections for three highly charged ions: hydrogenlike argon (Ar[sup 17+]), heliumlike argon (Ar[sup 16+]), and neonlike xenon (Xe[sup 44+]). The dielectronic recombination cross sections are compared to theoretical resonance strengths. The energy resolution of the experimental measurements is 18 eV FWHM. These experiments use the ion extraction system on the Electron Beam Ion Trap (EBIT). The interactions are measured through measurement of relative ion populations. 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 (EPIT) is described in detail. Relations between the important operating parameters are described. Physical processes which affect the populations of ions in the trap are discussed. The general rate equations for the time development of the ion populations are presented. The experiments for the three ions Ar[sup 17+], Ar[sup 16+], and Xe[sup 44+] are examined. The KLL, KLM, KLN, KLO and KLP groups of resonances of hydrogenlike 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. 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.

• Research Organization: California Univ., Davis, CA (United States)
• OSTI ID: 7014874
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ARGON IONS
RECOMBINATION
RESONANCE
TRAPPING
MULTICHARGED IONS
XENON IONS
ELECTRON BEAMS
EXPERIMENTAL DATA
BEAMS
CHARGED PARTICLES
DATA
INFORMATION
IONS
LEPTON BEAMS
NUMERICAL DATA
PARTICLE BEAMS
664000* - Atomic & Molecular Physics- (1992-)