Time-of-flight mass spectroscopy of benzophenone–benzene and benzophenone–1,4-cyclohexadiene clusters using one-color multiphoton ionization method

Benzophenone–benzene and benzophenone–1,4-cyclohexadiene clusters are studied by using one-color multiphoton ionization (MPI) method with time-of-flight (TOF) mass spectroscopy. Many kinds of benzophenone–benzene clusters are generated in the benzophenone–benzene expansion. TOF mass spectrum in the benzophenone–1,4-cyclohexadiene system was obtained with 270 nm laser light. The spectrum shows the ions composed of one benzophenone ketyl radical and several 1,4-cyclohexadiene molecules. It is revealed that hydrogen abstraction reaction occurs in benzophenone–1,4-cyclohexadiene clusters and benzophenone ketyl radical is what REMPI process proceeds through.