Quantum Beat Spectroscopy of SO₂ in the 235-224nm Range

Using time-resolved laser-induced fluorescence(L1F) spectroscopy, the fluorescence quantum beat decay was observed in C ( ¹B₂ ) ← X(¹A₁) transition of SO₂ molecule. The experimental results show that only the v₃ mode and its combination band v₁ + v₂ + v₃ excitation exist the beat decay. Analyzing the result, we attribute the quantum beat states to the coupling of the v₃ vibration mode of C state with the high vibrational levels of the electronic ground state.