@article{5819, author = {P. Kok and E. J. J. Groenen and L. van der Meer and W. van Amersfoort}, title = {IR spectroscopy with FELIX .2. Lowest triplet state of azabenzenes}, abstract = {IR spectra of the lowest triplet state T-0 of pyrazine, pyrimidine and pyridine have been recorded by the use of the free-electron laser FELIX. Vibrational transitions have been observed as laser-induced changes in the intensity of the phosphorescence from T-0. Five triplet vibrations have been recognised for pyrimidine and two for pyridine. For pyrazine, all seven fundamental IR-active triplet vibrations in the range 250-2000 cm(-1) have been detected and the vibrational frequencies are found to be considerably lower than the corresponding ones in the ground state.}, year = {1997}, journal = {Journal of the Chemical Society-Faraday Transactions}, volume = {93}, number = {9}, pages = {1727-1732}, month = {May 7}, isbn = {0956-5000}, doi = {10.1039/a607260g}, language = {eng}, }