Femtosecond Resolving Photodissociation Dynamics of the SO2 Molecule,The Journal of Physical Chemistry Letters

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Femtosecond Resolving Photodissociation Dynamics of the SO2 Molecule
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-04-01 , DOI: 10.1021/acs.jpclett.0c00599
Kang Lin ₁ , Xiaoqing Hu ₂ , Shengzhe Pan ₁ , Fei Chen ₁ , Qinying Ji ₁ , Wenbin Zhang ₁ , Hanxiao Li ₁ , Junjie Qiang ₁ , Fenghao Sun ₁ , Xiaochun Gong ₁ , Hui Li ₁ , Peifen Lu ₁ , Jianguo Wang ₂ , Yong Wu _{2,

3} , Jian Wu _{1,

4}

Affiliation

We experimentally investigate the ultrafast photodissociation dynamics of the SO₂ molecule induced by intense ultrashort laser pulses in a pump–probe scheme. Different three-body fragmentation pathways are discriminated using the time-dependent kinetic energy release spectrum with femtosecond time resolution. A nontrivial three-body fragmentation pathway, denoted as the bonding pathway, is unraveled, in which an intermediate fast rotating O₂ molecule is formed before complete fragmentation. The ultrafast chemical bond rearrangement after electron release is tracked in real time. The bonding pathway generally exists in the three-body fragmentation processes induced by strong laser fields of different wavelengths, which is observed in infrared, ultraviolet, and mixed two-color cases. Our findings are significant for understanding the photon-induced ultrafast processes of the SO₂ molecule in atmospheric chemistry.

中文翻译：

飞秒分辨SO ₂分子的光解离动力学

我们通过实验研究了在泵浦-探针方案中强烈的超短激光脉冲引起的SO ₂分子的超快光解离动力学。使用飞秒时间分辨率的时间依赖性动能释放谱来区分不同的三体破碎途径。揭示了一个非平凡的三体破碎途径，称为键合途径，其中中间快速旋转的O ₂分子在完全断裂之前形成。实时跟踪电子释放后的超快速化学键重排。结合途径通常存在于由不同波长的强激光场引起的三体破碎过程中，这在红外，紫外线和混合双色情况下观察到。我们的发现对于理解大气化学中光子诱导的SO ₂分子的超快过程具有重要意义。

更新日期：2020-04-24

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