Measurement of the efficiency of the fluorecence of some complex organic molecules in the gaseous phase

A method is suggested for estimating the relative efficiency of the fluorescence of vapors of complex organic compounds subjected to optical pumping. Measurements of the efficiency are reported for 25 organic molecules. It is shown that at vapor concentrations of 10¹⁶–10¹⁷ cm^–3 the quantum efficiency of the fluorescence emitted by some compounds is close to unity.