Susbstituent effects in mass spectrometry IV—an evaluation of empirical methods for calculating the ionisation potentials of para and meta disubstituted benzenes

Three empirical equation which have been used to calculate ionisation potentials of para and meta disubstituted benzenes are evalyated according to their ability to predict the IP's of para and meta YC₆H₄COX, (where x ? OH, NH₂, CL).