Fluorescence Emissions of Cycloalkanes and Mono-olefin by Controlled Electron Impact

Abstract

Abstract Emission spectra of cyclohexane, methylcyclohexane, trans-decalin and tetramethylethylene were measured under the controlled electron-impact (5–100 eV) excitation. A broad band was observed in the ultraviolet region in addition to lines and bands from such fragments as H, CH, and C2. This broad band was assigned to the fluorescence emission from the excited parent molecule, since its peak and lineshape resemble the fluorescence measured for liquid and since the threshold energy agrees with the absorption onset. The emission cross sections for these emissions were determined at an electron energy of 50 eV.