Fluorescence spectrum characteristic of ethanol--water excimer and mechanism of resonance energy transfer

The steady-state fluorescence spectrum characteristic ofethanol--water excimer has been studied in this paper. By analysingthe features of the sharp emission spectrum with fine structures in ashortwave band and the characteristics of the broad and featurelessfluorescence peaks in the longwave band, one can conclude that theexcimers are formed between the new ethanol--water cluster moleculesin the excited state and the ground state through the interactionamong different chromophores. The excitation spectra in the twofluorescence bands have been studied, and their emission mechanismshave been ascertained based on the energy transfer theory. Furthermore, the critical distance ofthe resonance energy transfer has been calculated.