Dissociative recombination of electrons withH2+in low vibrational states

Abstract

Cross sections for the dissociative recombination of electrons and H2 + ions having low internal energies have been measured by means of the merged electron-ion beam technique. Narrow resonances associated with indirect capture into high-lying Rydberg states of the neutral molecule have been found. The use of ions with only two vibrational states significantly populated has allowed the high-resolution capability of the merged-beam technique to be clearly demonstrated.

Dissociative recombination of the methane family ions: rate coefficients and implications

“…Each species must be dealt with on an individual basis. For instance, it has been observed that the DR cross-sections decrease with increasing vibrational excitation for NO þ (e.g., Mostefaoui et al, 1999), while for H þ 2 , the cross-sections increase with increasing vibrational excitation (e.g., Hus et al, 1988).…”

Electron-impact dissociative excitation of H+2: low energy studies

“…This was the case in the three crossed beam experiments. In 1988, Hus et al [8] reported measurements of cross sections for the dissociative excitation of vibrationally cooled H~ ions just above threshold. These ions had been prepared in a radiofrequency storage trap ion source.…”

Assignment of resonances in dissociative recombination of HD+ions: High-resolution measurements compared with accurate computations

“…This yields collision-energy resolved rate coefficients while, for sensitive comparison to theory, good control is needed over the ro-vibrational excitation of the incident cations. Following first results on H + 2 in single-pass merged beams [7], the infrared active isotopologue HD + moved into the focus of experiments [8][9][10][11] using the ion-storage ring technique [12], where fast ion beams are stored over many seconds and vibrational de-excitation of HD + is completed within much less than a second [13]. On H + 2 , storage-ring experiments gave access to vibrational de-excitation in electron collisions [14,15].…”