EFFECT OF MOLECULAR-ORIENTATION AN ELECTRON-IMPACT IONIZATION AND FRAGMENTATION

Relative ionization cross sections have been determined for the production of the molecular ion CH3Cl+ and the fragmentation product CH3+ from the 200 eV electron impact ionization of spatially oriented CH3Cl molecules in a cross beam experiment. The ionization cross section for CH3Cl+ formation is higher at the positive end, or CH3 end, of the molecule while the cross section for formation of the CH3+ fragmentation product is independent of spatial orientation, within experimental uncertainty. © 1994 American Institute of Physics.