Molecular Dynamics of Methylamine Following CH and NH Vibrational Excitation and Promotion to the à State

Abstract

AbstractThe molecular dynamics of methylamine, CH3NH2, was investigated via vibrationally mediated photodissociation. It was found that the ∼243.1 nm photolysis of initially excited N–H and C–H fundamental stretches and combinations and overtones of methyl deformation yields H photofragments. Surprisingly, the deformations promote the H atom release more effectively, implying mode‐dependent enhancement of photodissociation in a relatively large molecule with a torsional degree of freedom. The H Doppler profiles correspond to low translational energies, supporting the dominant non‐adiabatic N–H dissociation channel.