Systematic investigation of electron impact excitation-autoionization from the groud state of highly charged GaI-like ions through. Delta. N=1 transitions

Conference · Fri Jan 11 00:00:00 EST 1991

OSTI ID:6283465

Oreg, J; Bar-Shalom, A ^[1]; Goldstein, W H ^[2]; Mandlebaum, P; Mittnik, D; Meroz, E; Schwob, J L; Klapisch, M ^[3]

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1. Israel Atomic Energy Commission, Beersheba (Israel). Nuclear Research Center-Negev
2. Lawrence Livermore National Lab., CA (USA)
3. 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; TRN: 91-004481
• Resource Relation: Conference: International workshop on radiative properties of hot dense matter, Sarasota, FL (USA), 22-26 Oct 1990
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
MULTICHARGED IONS
INNER-SHELL EXCITATION
INNER-SHELL IONIZATION
RARE EARTHS
ELECTRON-ION COLLISIONS
TOKAMAK DEVICES
PLASMA DIAGNOSTICS
AUTOIONIZATION
ISOELECTRONIC ATOMS
TEMPERATURE DEPENDENCE
ATOMS
CHARGED PARTICLES
CLOSED PLASMA DEVICES
COLLISIONS
ELECTRON COLLISIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
ION COLLISIONS
IONIZATION
IONS
METALS
THERMONUCLEAR DEVICES
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory
640304 - Atomic
Molecular & Chemical Physics- Collision Phenomena
700102 - Fusion Energy- Plasma Research- Diagnostics