Publications by authors named "A Le Padellec"
Article Synopsis
- The study combines advanced computational methods to analyze how doubly charged uracil molecules break apart when hit by high-energy protons (100 keV).
- Findings align well with experimental data from ion-ion coincidence measurements, indicating reliable results.
- The research highlights that the arrangement of orbitals significantly influences fragmentation patterns, and that immediate dynamics after electron removal can lead to unexpected fragmentation outcomes that don't follow the most energetically favorable paths.
Article Synopsis
- The study explores how a 100 keV proton beam induces fragmentation in a doubly charged adenine molecule, focusing on understanding the dissociation dynamics and kinetic energy involved.
- Researchers used experimental data combined with computational methods to determine activation energies and observed metastable fragments, identifying one or two-step temporal mechanisms with lifetimes around 100-200 ns.
- The analysis revealed preferences in fragmentation pathways, notably favoring the emission of specific fragments, and allowed for comparisons of the dication's equivalent temperature with existing theoretical models.
Integral cross sections were measured for two reactions occurring in CH+ + O- collisions: the formation of the carbon monoxide cation CO+ via a reactive ionization process and the formation of the (iso)formyl cation HCO+ (HOC+) via the associative ionization process. Both carbon monoxide and formyl cations are present in the interstellar medium, the latter one being quite abundant in dense clouds. Provided the oxygen anion would also be present in the interstellar environment, the large efficiency of the two reactive processes reported here would justify their inclusion in astrochemical models.
View Article and Find Full Text PDFWe present a combined experimental and theoretical study of fragmentation of small Cn clusters (n = 5,7,9) produced in charge transfer collisions of fast (nu = 2.6 a.u.
View Article and Find Full Text PDFDissociative recombination of vibrationally relaxed H2O+ ions with electrons has been studied in the heavy-ion storage ring CRYRING. Absolute cross-sections have been measured for collision energies between 0 eV and 30 eV. The energy dependence of the cross-section below 0.
View Article and Find Full Text PDF