Calculated and observed ionization potentials of unsaturated polycyclic hydrocarbons; calculated heats of formation by several semiempirical s. c. f. m.o. methods

Abstract
The ionization potentials derived from breaks in the low-resolution photoelectron spectra of several polycyclic unsaturated hydrocarbons are reported. The observed ionization potentials are compared with values calculated for semiempirical s.c.f. m.o. procedures. Calculated heats of formation for the molecules are also reported.