Energy transfer of highly vibrationally excited 2-methylnaphthalene: Methylation effects

The methylation effects in the energy transfer between Kr atoms and highly vibrationally excited 2-methylnaphthalene in the triplet state were investigated using crossed-beam/time-sliced velocity-map ion imaging at a translational collision energy of similar to 520 cm(-1). Comparison of the energy transfer between naphthalene and 2-methylnaphthalene shows that the difference in total collisional cross section and the difference in energy transfer probability density functions are small. The ratio of the total cross sections is sigma(naphthalene): sigma(methylnaphthalene)=1.08 +/- 0.05:1. The energy transfer probability density function shows that naphthalene has a little larger probability at small T -> V/R energy transfer, Delta E-u < 300 cm(-1), and 2-methylnaphthalene has a little larger probability at large V -> T energy transfer, -800 cm(-1)