Measurement of the Rate Constant k (E) of the Unimolecular H_2 Elimination from Ethane Radical Cations in Reflectron Mass Spectrometer

摘要

A brief review of the literature concerning the H_2 loss reaction from ethane radical cations is given. The reaction most likely proceeds by tunneling of H atoms through a transfer barrier. In this contribution a new experimental approach is presented, which combines the high energy resolution of a zero kinetic energy (ZEKE) electron spec- trometer with the high kinetic resolution of a reflecting ion time of flight spectrometer in a coincidence experi- ment. With this technique it is possible to measure the rate constant k (E) of the title reaction an ion energy resolution of 10 meV directly over three orders of magnitude.