High-resolution studies of the x-ray transitions in highly charged neon-like ions on the PLT tokamak
X-ray spectra can provide valuable information on the atomic structure and the excitation mechanisms of highly charged ions, and their study is important for x-ray laser and fusion research as well as for the diagnosis of astrophysical and laser-produced plasmas. In the present work, high-resolution spectra of the n = 3 to n = 2 x-ray transitions in neonlike ions have been recorded on the Princeton Large Torus tokamak and are analyzed in detail. The observed spectra fall into the wavelength region 2.00-9.00 {angstrom} and originate from elements between Z = 34 (selenium) and Z = 63 (europium). A systematic determination of the wavelengths of the neonlike transitions has been made as function of atomic number. The wavelengths of the neonlike lines have been determined with the help of a large number of hydrogenlike and helium-like reference spectra. The hydrogen like and heliumlike spectra are also presented. The wavelength measurements are compared to results from advanced computer calculations, and the quantum electrodynamical contributions to the neonlike transition energies have been determined. The spectral line intensities of the neonlike transitions have been measured as a function of electron temperature and atomic number and are compared to theoretical lines ratios inferred from electron-impact excitation and radiative decay rates. In addition, the role of inner-shell ionization of sodiumlike ions in the excitation of neonlike ions is investigated. The process is shown to be significant for the excitation of certain neonlike levels, and its rate coefficient has been measured.
- Research Organization:
- Princeton Univ., NJ (USA)
- OSTI ID:
- 5541126
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NEON
ENERGY-LEVEL TRANSITIONS
ISOELECTRONIC ATOMS
ATOMIC NUMBER
COMPARATIVE EVALUATIONS
COMPUTER CALCULATIONS
ELECTRONIC STRUCTURE
EUROPIUM
EXCITATION
FLUORINE
INNER-SHELL IONIZATION
MULTICHARGED IONS
PLASMA
QUANTUM ELECTRODYNAMICS
SELENIUM
SODIUM
USES
WAVELENGTHS
X-RAY LASERS
X-RAY SPECTRA
ALKALI METALS
ATOMS
CHARGED PARTICLES
ELECTRODYNAMICS
ELEMENTS
FIELD THEORIES
FLUIDS
GASES
HALOGENS
IONIZATION
IONS
LASERS
METALS
NONMETALS
QUANTUM FIELD THEORY
RARE EARTHS
RARE GASES
SEMIMETALS
SPECTRA
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory