Electron-impact collisions with Be+ · Electron-impact collisions with Be+ Yuri Ralchenko and Dipti...
Transcript of Electron-impact collisions with Be+ · Electron-impact collisions with Be+ Yuri Ralchenko and Dipti...
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Electron-impact collisions with Be+
Yuri Ralchenko and Dipti National Institute of Standards and Technology Gaithersburg, MD, USA
IAEA, Vienna, Austria June 6, 2019
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IAEA, June 6, 2019
IAEA, June 6, 2019
Followup to the June 2015 meeting
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IAEA, June 6, 2019
Be I fits: excitation: CCC+BSR
• Dipole-allowed
• Dipole-forbidden
• Spin-forbidden
Correct asymptotic and threshold behavior
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IAEA, June 6, 2019
IAEA, June 6, 2019
Structure calculations: line strengths
𝐴 ∝ ∆ 𝐸3 ∙ 𝑆
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IAEA, June 6, 2019
IAEA, June 6, 2019Examples of fits
ioniz
da and df
sf
RC
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IAEA, June 6, 2019
Fit coefficients
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IAEA, June 6, 2019
NIFS database contents: exc+ion
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IAEA, June 6, 2019
Recent important publications (n≤4)
• 1997: Bartschat and Bray ▫ RMPS (26 states), CCC, n ●exc, ion, CS
• 2003: Ballance et al ▫ DW, R-matrix, RMPS (41 states), TDCC ●exc, ion, CS, RC
• 2011: Liang and Badnell ▫ ICFT R-matrix ●Exc, effective collision strengths
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IAEA, June 6, 2019
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IAEA, June 6, 2019
R-matrix (14 st) RMPS (41 st) CCC TDCC
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IAEA, June 6, 2019
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IAEA, June 6, 2019
Plan
• D. Fursa (Curtin) agreed to perform new calculations with CCC
• Approach C. Ballance, J. Colgan,... for the older data • Evaluate radiative parameters (should be very
straightforward, Li-like ion) • Fit the cross sections (collision strengths) ▫ Similar formulas but without (x-1) factor
• Publish in ADNDT