−5 eV and 10 eV have been performed, with a method based on the Multichannel Quantum Defect Theory. Comparisons of the DR rate coefficients with the plasma experimental results give a good agreement, confirming that the vibrationally excited NO + ions recombine more slowly than those in the ground state. Also, our ground state IC rate coefficients are very similar with previously computed R-matrix data. The rate coefficients have been fitted to a modified Arrhenius law, and the corresponding parameters are given, in order to facilitate the use of the reaction data in kinetical plasma modelling.

In the framework of the multi-channel quantum defect theory (MQDT), we have performed nonrotational computations for the dissociative excitation cross section of HD + initially in the vibrational level) of the electronic ground state, with electrons of energy ranging from 2 to 12 eV. Considering the case of energy-independent interactions, the reaction matrix K is evaluated in the second order of the Born expansion of the Lippmann-Schwinger equation.

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We investigate the isotopic effects on the cross sections of the dissociative excitation, dissociative recombination, vibrational excitation and vibrational de-excitation of the homonuclear hydrogen molecular cations with electrons of energy above the dissociation threshold of the electronic ground state. The computations were accomplished using an improved numerical code based on a previous work (Fifirig and Stroe 2008 Phys. Scr. 78 065302).

We have studied the electron impact dissociation of vibrationally excited H + 2 . A distribution of initial vibrational states given by the overlap factors between the vibrational ground state of H 2 and different vibrational levels of H + 2 has been considered. It was found that the relative contributions of the initial vibrational levels to the dissociative excitation cross section mimic the vibrational distribution of the H + 2 molecular ion for electron energies larger than the energy difference between the energy of the repulsive state 2 + u and that of the lowest vibrational level of the ground state X 2 + g at the outer classical turning point.