Hydrogen migration observed in fragmentation of the pyridine molecules in collisions with the H+, H2+, He+ and He++ cations

The hydrogen atom migration preceding fragmentation of the pyridine molecules by the H+, H-2(+), He+ and He++ collisions has been investigated in the 5-2000 eV energy range. The pyridine molecule structure is lacking of the NH group, thus formation of the NH radicals is an evidence of the H atom relocation prior to the cation-induced fragmentation. The NH(A(3)Pi) fragmentation yields measured by detecting its A(3)Pi -> X-3 Sigma(-) fluorescence show that it depends on the selected projectile and the projectile velocity.