A Lozier apparatus, modified in that a quasihyphen;monoenergetic electron beam is used, has been employed to study CO. Ionization efficiency curves for both positive and negative ions were collected. From a detailed treatment of these data we deduced the ions produced, the appearance potentials for ions formed with zero kinetic energy, the processes in which they were produced, and the states of excitation of the fragments formed. From an analysis of our results alone, the dissociation energy of CO and the electron affinity of oxygen were determined, and they agreed within experimental error with the spectroscopic value ofD(CO) of 11.11 ev and electron photodetachment value forEA(O) of 1.465 ev. Using the accepted values forD(CO) andEA(O), the electron affinity of carbon was determined from two different sets of our data to be between 1.34 and 1.74 ev. The lower value is in better agreement with other experimental determinations and with most of the recent empirical calculations for theEA(C).
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