Systematic investigation of electron impact excitation-autoionization from the groud state of highly charged GaI-like ions through. Delta. N=1 transitions
- Israel Atomic Energy Commission, Beersheba (Israel). Nuclear Research Center-Negev
- Lawrence Livermore National Lab., CA (USA)
- Hebrew Univ., Jerusalem (Israel). Racah Inst. of Physics
A systematic variation in the line intensity ratios of GaI-like and ZnI-like ions of rare earth elements has been recently observed in spectra emitted in a low density, high temperature tokamak plasma. This variation is shown to be correlated with the gradual opening of autoionizing channels through inner-shell excited configurations of the GaI-like charge-state. These channels enhance the indirect ionization rate of GaI-like ions through excitation-autoionization (EA), effecting the ionization balance and temperatures of greatest abundance. We present a systematic investigation of EA and direct impact ionization (DI) in the GaI-like isoelectronic sequence from Mo (Z = 42) to Dy (Z = 66). As Z decreases from Dy to Pr (Z = 59) the levels of the configuration 3d{sup 9}4p4f, which are excited from the ground state by strong dipole collisional transitions, gradually cross the first ionization limit of the ion and are responsible for this ionization enhancement. When Z decreases further an additional channel is opened through the configuration 3d{sup 9}4p4d. 9 refs., 3 figs., 1 tab.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6283465
- Report Number(s):
- UCRL-JC-105958; CONF-9010298--3; ON: DE91007611
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
640304 -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102 -- Fusion Energy-- Plasma Research-- Diagnostics
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
AUTOIONIZATION
CHARGED PARTICLES
CLOSED PLASMA DEVICES
COLLISIONS
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
INNER-SHELL EXCITATION
INNER-SHELL IONIZATION
ION COLLISIONS
IONIZATION
IONS
ISOELECTRONIC ATOMS
METALS
MULTICHARGED IONS
PLASMA DIAGNOSTICS
RARE EARTHS
TEMPERATURE DEPENDENCE
THERMONUCLEAR DEVICES
TOKAMAK DEVICES