Ionization and ultrafast hydrogen migration of methylamine in few-cycle intense near-infrared laser fields

Double ionization and ultrafast hydrogen migration of methylamine induced by a few-cycle intense near-infrared laser pulse are investigated by the coincidence momentum imaging method. By reference to the results obtained by DFT calculations, the peak profiles in the kinetic energy release distributions have been assigned to the singlet and triplet decomposition channels of CH3NH22+. The anisotropy in the angular distribution of the ejection direction of the fragment ions is interpreted based on the symmetries of the (7a') HOMO orbital. By the pump-probe measurements, it is revealed that the ultrafast hydrogen migration in CH3NH2+ proceeds within similar to 30 fs.

Automated summary

The double ionization and ultrafast hydrogen migration of methylamine induced by a few-cycle intense near-infrared laser pulse were investigated using the coincidence momentum imaging method. By analyzing the kinetic energy release distributions and the angular distributions of the fragment ions, the singlet and triplet decomposition channels of CH3NH22+ were identified. The ultrafast hydrogen migration in CH3NH2+ was found to occur within approximately 30 fs based on pump-probe measurements.