Emission Spectra of Benzene, Toluene, and Xylenes by Controlled Electron Impact

概要

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The emission spectra of gaseous aromatic hydrocarbons under electron impact excitation (60–300 eV) were measured in the 220–450 nm region at very low pressures. A characteristic band was observed in all cases in the 240–340 nm region; this band was assigned to the transition from the lowest excited singlet state to the electronic ground state. Photoemissions from the fragment species, such as H (Balmer series) and CH (A→X, B→X), were also observed. The excited species were concluded, from the relations of the emission intensities to the electron-beam current and to the gas pressure, to be produced by one-electron processes. The relative intensity and the vibrational structure of the observed spectra were examined and compared with those of the fluorescence spectra produced by photo-excitation.
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