DEGENERATE 4-WAVE-MIXING AND LASER-INDUCED FLUORESCENCE OF PYRAZINE AND PYRIDAZINE

Results from degenerate four wave mixing (DECVM) and laser induced flu orescence (LIF) of pyrazine and pyridazine are presented The DFWM spec trum of pyrazine from a supersonic jet reflected faithfully the absorp tion probability, while the LIF spectrum was complicated by rotation-d ependent intersystem crossing. The low fluorescence yield of pyridazin e prohibited direct LIF measurements, but its DFWM spectrum was in goo d agreement with previous absorption spectra. DFWM is an absorption ba sed technique, so it is ideal for high resolution absorption spectrosc opy studies when the upper state: dynamics are unfavorable for LIF det ection. (C) 1997 Elsevier Science B.V.