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Abstract: The formation and fragmentation of the indene dication is studied using synchrotron radiation. The double-ionization energy of indene amounts to 21.8±0.1eV. The appearance energies of the fragments and are 25.8±0.1eV and 25.7±0.2eV, respectively. Although the appearance energies are almost the same, the dicationic fragment is formed in a higher yield than . It is suggested that the elimination of atomic hydrogen is associated with a considerable energy barrier, whereas the H2 elimination proceeds via very small barrier or is barrier-less process with respect to the reaction endothermicity. [Copyright &y& Elsevier]

Abstract: Non-adiabatic direct dynamics calculations were carried out to investigate the radical and molecular decomposition channels of formic acid. The calculations show, in agreement with experiment, that the HCO+OH dissociation channel accounts for ∼70% of the product yields. In addition, the molecular eliminations of CO and CO2 are minor channels, with a CO/CO2 branching ratio that depends on what isomer is initially excited to the S1 state. This result is also in qualitative agreement with experimental results in an Ar matrix environment. [Copyright &y& Elsevier]