Resonance emission spectroscopy of predissociating SO2 C̃(1 1B2): Coupling with a repulsive 1A1 state near 200 nm
Resonance emission spectroscopy of predissociating SO2 C̃(1 1B2): Coupling with a repulsive 1A1 state near 200 nm
复制标题
预解离 SO2 C̃(1 1B2) 的共振发射光谱：与 200 nm 附近的排斥 1A1 态耦合
DOI：
10.1063/1.477139
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发表时间：
1998
影响因子：
4.4
通讯作者：
L. Butler
中科院分区：
文献类型：
--
作者：
P. Ray;M. Arendt;L. Butler
本文研究了SO2的预解离C（11B2）态，方法是在脉冲分子束中冷却SO2，并将共振激发下的发射分散到197 ~ 212 nm之间的C态的几个不同的振动吸收特征。与低激发能不同，高激发能下的散射发射光谱主要是反对称拉伸模ν3中奇数量子的级数和弯曲模ν2中多达6个量子的组合带。在射流冷却分子的反对称拉伸中具有奇量子的振动态发射的强大强度表明激发态高能量的中间态在非对称几何上具有混合电子特征，因此激发和发射跃迁矩的作用分量可能不同。我们考虑了C（11B2）态和两个有效解离态之间的避免交叉缝和耦合来讨论我们的结果。
This work investigates the predissociative C(11B2) state of SO2 by cooling the SO2 in a pulsed molecular beam and dispersing the emission upon resonant excitation into several different vibronic absorption features in the C state between 197 and 212 nm. Unlike at the lower excitation energies, the dispersed emission spectra at the higher excitation energies are dominated by progressions with odd quanta in the antisymmetric stretch mode ν3 and combination bands with up to six quanta in the bending mode ν2. The formidable intensity for emission into vibrational states with odd quanta in the antisymmetric stretch of the jet-cooled molecule suggests that the intermediate state at high energies in the excited state is of mixed electronic character at nonsymmetric geometries, so the operative components of the transition moment for excitation and emission may be different. We discuss our results by considering the avoided crossing seam and coupling between the C(11B2) state and two dissociative states potent...