Electron collisions with dimethylamine and trimethylamine molecules and molecular ions

Suliman M. Alshammari (1) , Jean-Luc Le Garrec (2, 3) , James Brian Alexander Mitchell (4)

1 KACST - King Abdulaziz City for Science and Technology [Riyadh]
2 IPR - Institut de Physique de Rennes
3 EAMEA - Ecole des applications militaires de l'énergie atomique
4 Merl-Consulting SAS

Experiments are described in which the dissociative recombination of trimethylamine and dimethylamine ions and related product ions, was studied using a Flowing Afterglow Langmuir Probe- Mass Spectrometer (FALP-MS) apparatus. The technique used in this experiment is based on the measurement of the decay of the electron density as an afterglow plasma flows along a drift tube. The results obtained for the DR for dimethylamine and trimethylamine ions were measured using three different methods. The results for trimethylamine ions are in reasonable accord with those for other polyatomic ions while for dimethylamine ions, are unreasonably high and this was explained by the competition from electron capture by neutral dimethylamine molecules.

Mots clés: Ion-molecule reactions; Flowing afterglow Langmuir probe- mass spectrometer (FALP-MS); Dissociative recombination of ions with electrons (DR); Dissociative electron attachment with neutral molecules (DEA); Cluster ions; Molecular physics

Domaines: Physique [physics]

Suliman M. Alshammari, Jean-Luc Le Garrec, James Brian Alexander Mitchell. Electron collisions with dimethylamine and trimethylamine molecules and molecular ions. International Journal of Mass Spectrometry, 2022, 474, pp.116802. ⟨10.1016/j.ijms.2022.116802⟩. ⟨hal-03596264⟩