Low-Energy Electron-Reflection Spectrometry for Thin Films of Aromatic and Aliphatic Molecules at 77°K

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Abstract
Low-energy electron-reflection (LEER) spectra have been measured for thin films of pyridine, mesitylene, toluene, aniline, 1-hexene, cyclohexene, 2-methylpentane, and cyclohexane at 77°K. Differential plots show clearly defined peaks which appear to correspond to near-resonant energy losses. For the aromatic molecules these peaks are matched by spectroscopically measured electronic energy levels, including both singlets and triplets. The aliphatic molecules show low-lying bands in the LEER spectra, indicating states which have not been proposed previously and do not correlate with spectroscopically measured energy levels. For 1-hexene the two lowest peaks occur at ∼ 3.1 and ∼ 4.6 eV; for cyclohexene at 3.0 and 4.7 eV; for 2-methylpentane at 3.9 and 4.9 eV; and for cyclohexane at 3.9 and 4.8 eV.