Eur. Phys. J. D 49, 185-192 (2008)
https://doi.org/10.1140/epjd/e2008-00157-4

Calculation of radiative transition probabilities and radiative recombination rate coefficients for H₂, OH, H₂⁺ and OH⁺ molecules

¹ Laboratoire de Spectroscopie Atomique, Moléculaire et Applications (LSAMA), Faculté des Sciences de Tunis, Université de Tunis el Manar, 1060 Tunis, Tunisia
² Laboratoire Plasma et Conversion d'Energie (LAPLACE), UMR UPS-INP-CNRS 5213, Université Paul Sabatier Toulouse 3, 118 route de Narbonne, 31062 Toulouse Cedex 09, France

Corresponding author: ^a philippe.teulet@laplace.univ-tlse.fr

Received: 2 June 2008
Published online: 8 August 2008

Abstract

A method is presented to calculate the radiative transition probabilities and the radiative recombination rate coefficients between electronic molecular states. Total transition probabilities are determined from vibrational transition probabilities without considering the detailed rotational structure of the molecular electronic states. Radiative recombination rate coefficients are obtained from the computation of vibrational photo-ionisation cross sections. Concerning spontaneous emission, Lyman (B → X) and Werner (C → X) band systems of H₂ and Meinel (A → X), (B → A) and (B → X) band systems of OH are investigated. For radiative recombination, transitions between H₂⁺(X) and H₂(X), and between OH⁺(X, a, A, b, and c) and OH(X) are considered. Transition probabilities and recombination rate coefficients are calculated as a function of temperature in the range 1500–15 000 K.