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Basic molecular processes for hydrocarbon spectroscopy in fusion edge plasmas: vibrationally state-selective excitation of A 2Δ, B 2Σ− and C 2Σ+ states of CH by electron impact

R Celiberto, R K Janev, D Reiter2009年Plasma Physics and Controlled FusionIF 2.2出版社

Quantification of chemical erosion in fusion edge plasmas is often based upon CH (Gerö-band) spectroscopy. Systematic, vibrationally resolved rate coefficients for the electron impact excitation of A 2Δ, B 2Σ− and C 2Σ+ electronic states of the CH molecule are presented in the temperature range 0.2–1500 eV. The rate coefficients for 0–0 vibrational transitions are based on the R-matrix cross sections for energies below 10 eV, Born–Bethe cross sections for energies above ∼25–30 eV and a smooth interpolation in the 10–20 eV energy range. The rate coefficients for the v–v' transitions are determined by using a scaling relationship. The implications of these results for the fusion edge/divertor plasma diagnostics, based on the A(v') → X(v) transitions, are discussed. The rate coefficients for the 0–0 transitions are presented by convenient analytic fit expressions.

日本語訳

核融合エッジプラズマにおける化学侵食の定量化は、しばしばCH(Geröバンド)分光法に基づいている。CH分子のA 2Δ、B 2Σ−およびC 2Σ+電子状態の電子衝突励起に対する、系統的な振動分解速度係数を0.2–1500 eVの温度範囲で提示する。0–0振動遷移の速度係数は、10 eV以下のエネルギーにおけるR行列断面積、約25–30 eV以上のエネルギーにおけるBorn–Bethe断面積、および10–20 eVのエネルギー範囲における滑らかな補間に基づいている。v–v'遷移の速度係数は、スケーリング関係を用いて決定される。A(v') → X(v)遷移に基づく核融合エッジ/ダイバータプラズマ診断に対するこれらの結果の意義について議論する。0–0遷移の速度係数は、簡便な解析的フィット式によって提示される。

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