Triplet exciton spectral line shapes in molecular crystals: 1,2,4,5-tetrachlorobenzene

摘要: Abstract Triplet exciton optical absorption line shapes, widths, and positions have been measured as a function of temperature in the molecular crystal 1,2,4,5-tetrachlorobenzene (TCB). At temperatures above 20 K has gaussian shape increases width with temperature. 14 becomes lorentzian. This change is discussed terms model first suggested by Toyozawa. The lorentzian taken to be evidence delocalized state, while high implies localization lattice phonons. nature difference between previously reported TCB ESR also briefly discussed.