Abstract
A recent measurement of the dielectronic recombination (DR) of W20+ [Schippers et al., Phys. Rev. A 83, 012711 (2011)] found an exceptionally large contribution from near-threshold resonances (less than or similar to 1 eV). This still affected the Maxwellian rate coefficient at much higher temperatures. The experimental result was found to be higher by a factor of 4 or more than that currently in use in the 100- to 300-eV range, which is of relevance for modeling magnetic fusion plasmas. We have carried out DR calculations with AUTOSTRUCTURE which include all significant single-electron promotions. Our intermediate-coupling (IC) results are more than a factor of 4 larger than our LS-coupling ones at 1 eV but still lie a factor of 3 below experiment here. If we assume complete (chaotic) mixing of near-threshold autoionizing states, then our results come into agreement (to within 20%) with experiment below less than or similar to 2 eV. Our total IC Maxwellian rate coefficients are 50%-30% smaller than those based on experiment over 100-300 eV.
| Language | English |
|---|---|
| Article number | 052716 |
| Number of pages | 9 |
| Journal | Physical Review A |
| Volume | 85 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 29 May 2012 |
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Keywords
- dielectronic recombination
- half open f shell
- modeling magnetic fusion plasmas
Cite this
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Dielectronic recombination of W20+ (4d(10)4 f(8)) : addressing the half-open f shell. / Badnell, N. R.; Ballance, C. P.; Griffin, D. C.; O'Mullane, M.
In: Physical Review A, Vol. 85, No. 5, 052716, 29.05.2012.Research output: Contribution to journal › Article
TY - JOUR
T1 - Dielectronic recombination of W20+ (4d(10)4 f(8))
T2 - Physical Review A - Atomic, Molecular, and Optical Physics
AU - Badnell, N. R.
AU - Ballance, C. P.
AU - Griffin, D. C.
AU - O'Mullane, M.
PY - 2012/5/29
Y1 - 2012/5/29
N2 - A recent measurement of the dielectronic recombination (DR) of W20+ [Schippers et al., Phys. Rev. A 83, 012711 (2011)] found an exceptionally large contribution from near-threshold resonances (less than or similar to 1 eV). This still affected the Maxwellian rate coefficient at much higher temperatures. The experimental result was found to be higher by a factor of 4 or more than that currently in use in the 100- to 300-eV range, which is of relevance for modeling magnetic fusion plasmas. We have carried out DR calculations with AUTOSTRUCTURE which include all significant single-electron promotions. Our intermediate-coupling (IC) results are more than a factor of 4 larger than our LS-coupling ones at 1 eV but still lie a factor of 3 below experiment here. If we assume complete (chaotic) mixing of near-threshold autoionizing states, then our results come into agreement (to within 20%) with experiment below less than or similar to 2 eV. Our total IC Maxwellian rate coefficients are 50%-30% smaller than those based on experiment over 100-300 eV.
AB - A recent measurement of the dielectronic recombination (DR) of W20+ [Schippers et al., Phys. Rev. A 83, 012711 (2011)] found an exceptionally large contribution from near-threshold resonances (less than or similar to 1 eV). This still affected the Maxwellian rate coefficient at much higher temperatures. The experimental result was found to be higher by a factor of 4 or more than that currently in use in the 100- to 300-eV range, which is of relevance for modeling magnetic fusion plasmas. We have carried out DR calculations with AUTOSTRUCTURE which include all significant single-electron promotions. Our intermediate-coupling (IC) results are more than a factor of 4 larger than our LS-coupling ones at 1 eV but still lie a factor of 3 below experiment here. If we assume complete (chaotic) mixing of near-threshold autoionizing states, then our results come into agreement (to within 20%) with experiment below less than or similar to 2 eV. Our total IC Maxwellian rate coefficients are 50%-30% smaller than those based on experiment over 100-300 eV.
KW - dielectronic recombination
KW - half open f shell
KW - modeling magnetic fusion plasmas
U2 - 10.1103/PhysRevA.85.052716
DO - 10.1103/PhysRevA.85.052716
M3 - Article
VL - 85
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
SN - 1050-2947
IS - 5
M1 - 052716
ER -