Studies of Ionization Efficiency. Part II. The Ionization Potentials of Some Organic Molecules

The ionization potentials of some 83 organic molecules have been measured with the mass spectrometer, using the critical slope method to interpret the ionization efficiency curves for the molecular ions. A self-consistent group of values has been obtained in which the main relationships between ionization potential and molecular structure can be clearly distinguished. The results are compared with those obtained by spectroscopic and other methods, and some regularities in the discrepancies are pointed out.