Triplet-state dynamics at low pressures as studied by electron-impact-induced phosphorescence: Acetophenone

Abstract

Electron-impact-induced phosphorescence was observed for acetophenone at pressures between 3.2 and 48 mTorr. In addition to normal phosphorescence from the T 1 zero-point level, we observed phosphorescence from vibrationally excited T 1 molecules at lower pressures. Collisional quenching of the triplet levels is discussed based on the pressure dependence of the phosphorescence. Excitation functions were measured for these two kinds of phosphorescence and the mechanism of triplet-state formation is discussed.