PHOTOELECTRON SPECTRUM OF MALONALDEHYDE
The photoelectron spectrum (PES) of malonaldehyde was measured and assigned in comparison with those of acetylacetone, trifluoroacetylacetone, and hexafluoroacetylacetone. The first and the second bands of malonaldehyde were attributed to the ionizations from the b2π and the b1n orbitals, respectively, on the basis of the methyl and trifluoromethyl substituent effects and the PES result of acetylacetone.