THEORY AND APPLICATION OF PHOTOELECTRON-SPECTROSCOPY .70. PHOTOELECTRON-SPECTRA OF 1,2-DIPHENYLCYCLOPROPENE, 2,3-DIPHENYLCYCLOPROPENONE, 2,3-DIPHENYLCYCLOPROPENETHIONE, 2,3-DIPHENYLTHIIRENE 1-OXIDE, AND CIS-STILBENE - EXPERIMENTAL-VERIFICATION OF CONJUGATIVE AND INDUCTIVE INTERACTIONS