The He(I) Photoelectron Spectrum of Cyclobutene‐1,2‐dione and o‐Benzoquinone

Abstract
The He(I)photoelectron spectra of cyclobutene‐1,2‐dione (1), o‐benzoquinone (4) and alkyl substitution products of 1 and 4 have been recorded. The first bands of the spectra have been assigned on the basis of molecular orbital calculations and qualitative band shape criteria.

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