The effects of bending and stretching vibration on the reaction of acetylene cations with methane

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Abstract
Multiphoton ionization (MPI) has been used to create C2H+2 in selected vibrational states, with excitation in either ν2 (C–C stretch) or a bending vibration (ν5-cis bend). Reactions of the state selected ions with CH4 and CD4 have been studied in a guided beam mass spectrometer. Absolute cross sections for formation of C3H+n (n=3,4,5) and C2H+3 products are reported for collision energies ranging from 60 meV to 5 eV. Evidence for both complex formation and direct reaction mechanisms is found. Vibrational excitation has different effects on the various product cross sections in different collision energy regimes. Bending excitation has also been found to cause somewhat different effects than C–C stretching vibration.