Cross-section and rate coefficient calculation for electron impact
excitation, ionisation and dissociation of H2 and OH molecules |
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Authors: | R Riahi Ph Teulet Z Ben Lakhdar A Gleizes |
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Institution: | (1) Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Département de Physique, Faculté des Sciences de Tunis, Université de Tunis el Manar, 1060 Tunis, Tunisia;(2) Centre de Physique des Plasmas et Applications de Toulouse, UMR CNRS 5002, Université Paul Sabatier Toulouse 3, 118 route de Narbonne, 31062 Toulouse Cedex 09, France |
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Abstract: | The weighted total cross-section (WTCS) theory is used to
calculate electron impact excitation, ionisation and dissociation cross-sections and rate coefficients of OH, H2, OH+, H2
+,
OH- and H2
- diatomic molecules in the temperature range 1500–15000 K. Calculations are performed for H2(X, B, C), OH(X, A, B),
H2
+(X), OH+(X, a, A, b, c), H2
-(X) and OH-(X)
electronic states for which Dunham coefficients are available. Rate
coefficients are calculated from WTCS assuming Maxwellian energy
distribution functions for electrons and heavy particles. One and two
temperature (θe and θg respectively for electron
and heavy particles kinetic temperatures) results are presented and fitting
parameters (a, b and c) are given for each reaction rate coefficient:
k(θ) = a (θb)exp (-c/θ). |
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Keywords: | 52 20 -j Elementary processes in plasmas 52 20 Fs Electron collisions 82 33 Xj Plasma reactions |
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