Abstract
This Chapter deals with internal transitions, induced by electron impact, of diatomic molecules initially in a given quantum state, with particular emphasis on the vibrational excitations, which play a prominent role in the energy balance of the molecular plasmas (Capitelli et al. 2011). An efficient process for the activation of the vibrational degrees of freedom is represented by the resonant collisions whose mechanism involves the capture from the molecule of the incident electron, with the concomitant formation of a molecular anion. This is a transient species, better described as a resonant state, which can either decay, by electron emission, back into some excited vibrational level of the neutral molecule, giving rise to the so-called resonant vibrational excitation (RVE), or can dissociate by production of a neutral atom and a negative atomic ion. This last process, known as dissociative electron attachment (DEA), can occur if the atomic negative ion exists in a stable state. Unlike the direct inelastic vibrational excitation, which is an inefficient process usually involving few vibrational levels, particularly for homonuclear molecules owing no permanent dipole moment, multi-quantum vibrational transitions can occur, on the contrary, through the above resonant mechanism which can promote effectively the activation of high vibrational levels.
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Capitelli, M. et al. (2016). Electron-Molecule Collision Cross Sections and Rate Coefficients for Processes Involving Excited States. In: Fundamental Aspects of Plasma Chemical Physics. Springer Series on Atomic, Optical, and Plasma Physics, vol 85. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-8185-1_1
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