Isoelectronic behavior of resonant and intercombination lines in MgI-like ions
Conference
·
OSTI ID:119994
- Lawrence Livermore National Lab., CA (United States)
- Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Physics and Astronomy
- Princeton Univ., NJ (United States). Princeton Plasma Physics Lab.
- Massachusetts Inst. of Tech., Cambridge, MA (United States). Plasma Fusion Center
Radiative transitions with very different characteristic rates can serve as important diagnostics of local conditions in a plasma. Here, the observed intensity ratio of the 3s{sup 2} {sup 1}S{sub 0} - 3s3p {sup 1}P{sub 1} to the 3s{sup 2} {sup 1}S{sub 0} - 3s3p {sup 3}P{sub 1} transitions in MgI-like ions has always presented those who model plasma spectra with a challenge; the observed intensity of the intercombination line is always several times greater than what simple models predict. The authors offer a model that takes into account the contribution to the MgI-like emission features from autoionizing levels of the adjacent AlI-like charge state. Models in the present work, which include the effects of configuration interaction on ionic wavefunctions, and the contribution of both direct, impact ionization and autoionization channels from the AlI-like ion to the MgI-like ion, give good agreement with the observed resonant/intercombination (R/I) emission ratio only when a departure from ionization equilibrium is assumed. The authors also identify, for the first time, intercombination lines of the form 3s3p {sup 1}P{sub 1} - 3p{sup 2} {sup 3}P{sub 2} in several elements relevant to both astrophysical and magnetically-confined fusion plasmas.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 119994
- Report Number(s):
- UCRL-JC--121954; CONF-950859--3; ON: DE96001733
- Country of Publication:
- United States
- Language:
- English
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