We studied the ultrafast nuclear dynamics during the dissociation of ${\mathrm{OCS}}^{+}$ molecules using a strong IR-laser pump and probe technique in combination with the coincidence measurement. The nuclear movement is tracked by analyzing the time-dependent kinetic energy release (KER) spectra. The involved dissociation states and pathways are assigned with the help of the semiclassical Landau-Zener surface hopping calculations. The real-time bond-breaking dynamics of the $3^{2}A{}^{\prime }$ coupling to other states are observed for the two-body dissociation channel and the three-body dissociation channel but with high KER. The three-body dissociation channel with low KER is assigned to the direct breaking process from the $3^{2}A{}^{″}$ state. The overall agreements between the experimental and theoretical results demonstrate that the time-resolved Coulomb-explosion imaging is a valuable way to monitor the bond breaking and structural evolution of complex molecules.

中文翻译：

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通过时间分辨库仑爆炸成像跟踪强场电离后羰基硫阳离子的核运动

我们研究了解离过程中的超快核动力学。 ${\mathrm{OCS}}^{+}$分子使用强大的红外激光泵和探针技术，同时进行重合测量。通过分析随时间变化的动能释放（KER）光谱来跟踪核运动。在半经典的Landau-Zener表面跳变计算的帮助下分配了涉及的解离状态和途径。债券实时打破债券的动态$3^{\mathrm{2个}}\mathrm{一种}{}^{\prime }$对于二体解离通道和三体解离通道，观察到与其他状态的耦合，但KER较高。具有低KER的三体解离通道被分配给从$3^{\mathrm{2个}}\mathrm{一种}{}^{\text{'}\text{'}}$状态。实验结果和理论结果之间的总体一致性表明，时间分辨库仑爆炸成像是监测复杂分子的键断裂和结构演变的宝贵方法。