Photo- and collision-induced dissociation of Ar cluster ions

摘要

Photo- and collision-induced dissociation of an argon cluster ion, Ar$-n$/$+$PLU$/, were investigated by use of mass spectrometry. The kinetic and angular distributions of the ionic and neutral photofragments revealed two reaction pathways: dissociation of the trimeric core ion and evaporation from its solvation shell. In the Kr and Ne collisions with Ar$- n$/$+$PLU$/, the size- and collision energy-dependencies of the dissociation cross sections were explained in the scheme of the charge-induced dipole, and dipole-induced scatterings. Conversion efficiency of the collision energy into the internal energy of Ar$-n$/$+$PLU$/ was found to be proportional to the internal degrees of freedom. The upper limit of the conversion efficiency was estimated to be about 60% in the collision energy of 0.2 eV.