Ion Energy-Loss Spectroscopy for the Collision of Ar+(2PJ) with H2and N2

Excitation and de-excitation processes in the collisions of Ar + ( 2 P J ) with H 2 and N 2 were studied below 2 keV by high resolution ion energy-loss spectroscopy. For both systems, fine structure transitions between the different \({J}\) states of Ar + vibrational excitations of target molecules for fundamental and harmonic mode were observed. In addition to them, coupled transition of fine structure transition and vibrational excitation were observed. Cross sections were determined for all the transitions observed. The measured cross sections align in the reciprocal order of the energy defect Δ E . This simple Δ E -dependence is explained well by the assumption that all the transition take place through the two step process via charge transfer channel as an intermediate state.