Rotational transitions induced by collisions ofHD+ions with low-energy electrons

Abstract

A series of computations based on multichannel quantum defect theory have been performed in order to produce the cross sections of rotational transitions (excitationsto 10) and of their competitive process, the dissociative recombination, induced by collisions of HD + ions with electrons in the energy range 10 −5 to 0.3 eV. Maxwell anisotropic rate coefficients, obtained from these cross sections in the conditions of the Heidelberg Test Storage Ring (TSR) experiments (k B T t = 2.8 meV and k B T l = 45 μeV), have been reported for those processes in the same electronic energy range. Maxwell isotropic rate coefficients have been presented as well for electronic temperatures up to a few hundred Kelvins. Very good overall agreement is found between our results for rotational transitions and the former theoretical computations as well as with experiment. Furthermore, due to the full rotational computations performed, the accuracy of the resulting dissociative recombination cross sections is improved considerably.

Theoretical study of ArH+ dissociative recombination and electron-impact vibrational excitation

“…The MQDT method (Giusti 1980;Guberman & Giusti-Suzor 1991;Chakrabarti et al 2013;Motapon et al 2014;Little et al 2014;Epée Epée et al 2015) was used to study the processes (1) and (2). Within this approach, the corresponding cross sections are expressed in terms of S-matrix Figure 1.…”

Dissociative Recombination of CH+ Molecular Ion Induced by Very Low Energy Electrons

“…The process is the so-called inelastic collision (IC), if N + i < N + f and superelastic collision (SEC) for N + i > N + f . A detailed description of our theoretical approach is given in previous studies on H + 2 and HD + [17][18][19][20]. The major steps of the method are briefly outlined as follows:…”

Advances in the MQDT approach of electron/molecular cation reactive collisions: High precision extensive calculations for applications

“…After having intensively studied the dissociative recombination and the vibrational transitions in H + 2 and HD + [18,32], we have recently focused on the electron-impact rotational transitions of these ions at very low collision energies [30]. Figure 1 displays our results for vibrationally relaxed HD + (X 2 + g ), compared with those obtained by the adiabatic nuclei rotation (ANR) approximation.…”