The study of ion/molecule thermochemistry of chlorotitanium ions utilizing a hybrid mass spectromete

A hybrid mass spectrometer has been modified to study ion/molecule thermochemistry. The principle components of the mass spectrometer are: electron-impact (EI) ionization source, magnetic sector for mass selecting the reagent ions, deceleration lens to reduce the reagent ion kinetic energy from approximately 1000 eV to 0-50 eV, an octopole to act as a beam guide to assure efficient collection of product ions, a collision cell in which the gas-phase chemistry occurs, a quadrupole for mass selecting both product and reagent ions exiting the octopole, and a daly-type detector with which standard pulse-counting techniques were employed. The principle of operation of each component is described here.;Experimental procedures are presented as well as the method for data analysis. Experiments designed to evaluate both the accuracy of the reagent ion kinetic energy and for the collection efficiency of the beam guide are described.;The gas-phase chemistry of chlorotitanium ions was studied using the mass spectrometer. Collision-induced dissociation (CID) experiments performed on TiCl$sb{rm n}sp+$ + (n = 1-4) ions generated by 70 eV EI on TiCl$sb4$ provided a measurement of the excess internal energy imparted to the ions during ionization. This information was then used to evaluate chemistry of the TiCl$sb{rm n}sp+$ ions with oxygen-containing compounds and isobutene.