- The lowest excited triplet (T1) energies of p-methoxybenzaldehyde and p-cyanobenzaldehyde vapors estimated from the temperature dependence of the T2(n, pi*) phosphorescence and the S1(n, pi*) fluorescence spectra. Itoh, T. Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy. (2003)