ChemInform Abstract: EMISSION SPECTRA OF PHENOL, ANISOLE, AND PHENETOLE BY CONTROLLED ELECTRON IMPACT

Abstract

Upon the impact of an electron beam (100–450 eV) on PhOH, PhOCH3, PhOC2H5, PhCOCH3, and (Ph)2CO at low pressures, the S1 emission of the parent molecule (not from PhCOCH3 and (Ph)2CO) and the photo-emissions from such fragments as H, CH, CO, CO+, and OH were observed in the 200–520 nm region. It was concluded that the S1 emission of the parent molecule originates through both the S0→S1 and S0→S2 (cascade)→S1 excitation processes and that the direct excitation into the lower vibronic levels of S1 is responsible for the appearance of the vibrational structures. Most excited species including CO+(A) from PhOH were confirmed to be primarily produced; however, CO+(A) from PhOCH3, PhOC2H5, and PhCOCH3, and CO(b) from PhCOCH3 were found to be produced competitively through one-electron and two-electron excitation processes in relation to the intensity measurements. The relative contribution of the two-electron excitation process in producing CO+(A) increased with a larger substituent, and it was larger than that...