Quantification of chemical erosion in fusion edge plasmas is often based upon CH (Gero-band) spectroscopy. Systematic, vibrationally resolved rate coefficients for the electron impact excitation of A (2)Delta, B (2)Sigma(-) and C (2)Sigma(+) 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 similar to 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.

Basic molecular processes for hydrocarbon spectroscopy in fusion edge plasmas: vibrationally state-selective excitation of A (2)Delta, B (2)Sigma(-) and C (2)Sigma(+) states of CH by electron impact / Celiberto, Roberto; Janev, Rk; Reiter, D.. - In: PLASMA PHYSICS AND CONTROLLED FUSION. - ISSN 0741-3335. - 51:8(2009). [10.1088/0741-3335/51/8/085012]

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

CELIBERTO, Roberto;
2009-01-01

Abstract

Quantification of chemical erosion in fusion edge plasmas is often based upon CH (Gero-band) spectroscopy. Systematic, vibrationally resolved rate coefficients for the electron impact excitation of A (2)Delta, B (2)Sigma(-) and C (2)Sigma(+) 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 similar to 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.
2009
Basic molecular processes for hydrocarbon spectroscopy in fusion edge plasmas: vibrationally state-selective excitation of A (2)Delta, B (2)Sigma(-) and C (2)Sigma(+) states of CH by electron impact / Celiberto, Roberto; Janev, Rk; Reiter, D.. - In: PLASMA PHYSICS AND CONTROLLED FUSION. - ISSN 0741-3335. - 51:8(2009). [10.1088/0741-3335/51/8/085012]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/5131
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