Abstract
The time-resolved low-temperature phosphorescence spectra of the ortho-bromobenzophenone (2-BrBP) crystal are investigated at a temperature of 52K. The spectra show that the emission of one series of vibrational bands of the phosphorescence decays in time, while the emission of another series of vibrational bands, which is identical but shifted to longer wavelengths, first rises and then decays. This behavior of the spectrum at the given temperature is explained by the overcoming of an energy barrier between two conformational states of the excited ortho-bromobenzophenone molecule. Besides the phosphorescence of the two series of vibrational bands, the time-resolved spectrum of the ortho-bromobenzophenone crystal at the given temperature exhibits excimer emission, which decays over a time ≈175μs.
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