He I photoelectron spectra of ethylene carbonate and related compounds.

He I photoelectron spectra of ethylene carbonate, propylene carbonate, γ-butyrolactone, β-propiolactone and vinylene carbonate have been investigated. Assignments of an oxygen lone pair and nonbonding π orbitals have been made by means of analysis of vibrational structures and molecular orbital calculation. Many vibrational structures could be assigned to appropriate vibrational modes of the corresponding neutral molecules from a comparison with infrared and Raman spectra. Correlation among the orbital energies of the compounds is discussed.

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