Dissociative excitation of HD +, D 2+, and DT + by electron impact

Abstract

Abstract:In the framework of the Multi-Channel Quantum Defect Theory (MQDT), a theoretical study of the dissociative excitation is presented. Numerical results for the dissociative excitation cross sections of HD + , D + 2 , and DT + with electrons of energy between 2 and 12 eV are reported. The contribution of the vibrational continua of the two lowest electronic states as explicit ionization channels has been considered. Within a quasi-diabatic representation of the molecular electronic states, the Born expansion of second order is done in the K-matrix evaluation.

Electron– and positron–molecule scattering: development of the molecular convergent close-coupling method

“…The poor agreement with experiment below 13 eV comes from the indirect resonant electron attachment processes neglected in the current formalism. For HD + in the v i = 0 state the direct DE mechanism (excitation to the p 2 u s ) starts to contribute to the DE cross section at approximately 9 eV, while the indirect mechanism contribution starts to diminish at 9 eV and practically goes to zero at approximately 13 eV [100]. The reasonably good agreement between the adiabatic-nuclei CCC results and experiment indicates the dominance of the direct-scattering process above 10 eV, which is consistent with findings of Duca and Fifirig [100] and Fifirig and Stroe [86].…”

“…In the above section the analytic Born matrix elements (100) were evaluated in the body-frame. Following from the definition of the body-frame scattering amplitude in equation (33), and noting the definition of the first-Born approximation q q q q T V , 105…”