In this thesis I report on the dynamical scattering properties of proton transfer reactions producing the isomers HCO+ and HOC+. The two investigated reactions are H+3+CO-HCO+/HOC++H2 and HOCO++CO-HCO+/HOC++CO2. The first of these ion-molecule reactions is of great interest in astrochemistry because it involves one of the most abundant ions (trihydrogen cation), as well as the second-most common molecule (carbon monoxide) in the interstellar medium and circumstellar envelopes. The first section of this thesis describes a summary of previous investigations of the two isomers, either astronomical observations, theoretical calculations or experimental studies. Furthermore the experimental setup applied for the gas phase study, consisting of a crossed beam machinery in combination with a velocity map imaging spectrometer, is described. In the second part I discuss the measurement results of the two reaction. The obtained 3D-velocity images show forward scattering for all investigated collision energies but a kinematic separation of both species is not possible. A fit for the internal energy distribution of the reactions is performed and an upper bound for the HOC+/HOC+ ratio is determined. The limiting factor for a separation of the two isomers appears to be the high internal excitation of the products. The thesis concludes with an outlook for the improvement concerning the ion-beam preparation, as well as further experimental plans.