Fragmentation and ionization of CH Cl by positron impact

The yields of positive ionic fragments produced by positron impact from CH3Cl have been studied in the energy range from threshold to 50 eV. The interactions take place whilst the positrons are stored in a Penning trap and the ions are detected using a time of flight mass spectrometer. The cross-sections for production of the parent molecular ion and the fragment CHq3 are presented. q1999 Elsevier Science B.V. All rights reserved