Photodissociation dynamics of the 2-propyl radical,C3H7

摘要

The photodissociation of 2-propyl leading to propene+H was investigated with nanosecond time resolution.A supersonic beam of isolated 2-propyl radicals was produced by pyrolysis of 2-bromopopane.The kinetic energy release of the H-atom photofragment was monitored as a function of excitation wavelength by photofragment Doppler spectroscopy via the Lyman-alpha transition.The loss of hydrogen atoms after excitation proceeds in a position to the radical center with a rate constant of 5.8 X 10~7 s~(_1)at 254 nm.Approximately 20% of the excess energy is deposited as translation in the H-atom photofragment.In contrast 1-propyl does not lose H atoms to a significant extent.The experimental results are compared to simple Rice-Ramsperger-Kassel-Marcus calculations.The possible reaction pathways are examined in hybrid density functional theory calculations.