Emission and excitation spectra of 2- and 3-fluoropyridine (2- and 3-FP, respectively) vapors have been measured under the different conditions. It is shown that 3-FP vapor emits weak fluorescence from the S-1(n, pi*) states. The fluorescence quantum yields are evaluated to be approximately 10 (3) and 10 (4) for 2- and 3-FP vapors, respectively, following the excitation into the S-1 origin. The fluorescence yields decrease significantly with increasing excitation energy. The decrease of the yield is more significant for 2-FP than for 3-FP vapor. The data include vibrational analyses of the hot bands in the excitation spectra using the DFT calculation at the B3LYP/6-311++G** level. (C) 2010 Elsevier B.V. All rights reserved.