P. Kok et al., THE INFRARED-SPECTRUM OF PYRAZINE IN ITS METASTABLE TRIPLET-STATE - AFREE-ELECTRON-LASER STUDY, The Journal of chemical physics, 106(7), 1997, pp. 2984-2986
Vibrational transitions of pyrazine in the lowest triplet state have b
een observed as transient changes in the intensity of the phosphoresce
nce induced by the free-electron laser FELIX. All seven fundamental in
frared-active modes in the range of 250 to 1600 cm(-1) have been detec
ted and all vibrational frequencies are found to be considerably lower
than the corresponding ones in the ground state. (C) 1997 American In
stitute of Physics.