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State-to-state electron impact cross sections for BeH+ molecular ions in ITER-like fusion edge plasmas with Be walls

R Celiberto, R K Janev, D Reiter2012年Plasma Physics and Controlled FusionIF 2.2出版社

BeH+ molecules will be an important intermediary species present in fusion plasmas with Be walls (e.g. JET, ITER), both for impurity transport and spectroscopic studies. To enable such analyses the electron-impact-induced excitations X 1Σ+(vi) → A 1Σ+(vf) and X 1Σ+(vi) → B 1Π(vf) in BeH+(vi) molecular ion, occurring between the vi and vf vibrational levels of different electronic states (vibro-electronic transitions), have been studied using the Coulomb–Born approximation. The cross sections and rate coefficients for these transitions have been calculated in a broad energy and temperature range, respectively. Accurate analytic fit expressions have been derived for the cross sections and rate coefficients for the vi = vf = 0 case of considered electronic transitions that have correct asymptotic limits. It has been demonstrated that the cross sections and rate coefficients for vi, vf > 0 transitions satisfy approximate (to within 10%) scaling relationships that involve the transition energies and matrix elements of dipole transition moments only.

日本語訳

BeH+分子は、Be壁を有する核融合プラズマ(例:JET、ITER)において、不純物輸送と分光学的研究の両方にとって重要な中間種となるであろう。そのような解析を可能にするため、BeH+分子イオンにおける電子衝突誘起励起X¹Σ⁺(vᵢ) → A¹Σ⁺(v_f)およびX¹Σ⁺(vᵢ) → B¹Π(v_f)(異なる電子状態のvᵢとv_f振動準位間で生じる振電遷移)がクーロン・ボルン近似を用いて研究された。これらの遷移の衝突断面積は広いエネルギー範囲にわたって計算され、速度係数は広い温度範囲にわたって計算された。考慮された電子遷移のvᵢ = v_f = 0の場合について、正確な漸近極限を有する衝突断面積と速度係数の精密な解析的フィッティング式が導出された。vᵢ, v_f > 0の遷移に対する衝突断面積と速度係数は、遷移エネルギーと双極子遷移行列要素のみを含む近似スケーリング則(約10%以内の精度)を満たすことが実証された。

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