Abstract
A new reaction scheme is proposed to account for roaming and chaotic behaviors in collisional and photo-initiated molecular-beam reactions, where nonadiabatic dynamics plays a key role and the collapse of superposition of wave functions is considered to be important in the beginning of the present scheme. Since the feature of molecular orbitals of reagents is crucial in reaction, we showed how to map out the spatial distribution of the relevant HOMO molecular orbitals of CH3Cl in the impact of fast electrons. We identified by experiment that the multiple overlap of nearby molecular orbitals affects even the vibrational motion of adjacent molecule DCl of the transient [ClDCl] chemical species. We also showed dynamical steric effects in the HBr + OH four-atom reaction as a manifestation of the nonadiabatic dynamics in complex systems. The roaming mechanism in the photo-initiated reaction of methyl formate is clarified in detail by experiment as well as the QCT trajectory calculation, where the conical intersection region plays an essential role. We suggest that two types of roaming trajectories coexist, i.e., deterministic and chaotic roaming trajectories based on classical trajectory calculations. To clarify the nonadiabatic dynamics in the roaming mechanism for non-collinear three-dimensional (3D) collisions, a new model of the 3D Polanyi rule is proposed as the extension of the well-established 2D Polanyi rule. In the 3D Polanyi rule, it is expected that the curvature and torsion of Frenet–Serret formulas in three-dimensional space would provide us key concepts in understanding reaction dynamics.
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Acknowledgements
The authors sincerely would like to dedicate the present work to Emeritus professor of Osaka University Keiji Kuwata who passed away on March 6, 2018. Prof. Kuwata was a pioneer and guided them to this exciting research field. They are grateful to Prof. Wilson Agerico Dino, and Jeffrey Tanudji, Department of Applied Physics, Graduate School of Engineering, Osaka University for stimulating discussion. TK thanks Prof. Hikaru Kobayashi, Institute of Scientific and industrial Research, Osaka University for his valuable comments, and appreciates Department of Chemistry, National Taiwan University for a financial support to carry out this work.
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Kasai, T., Che, DC., Tsai, PY. et al. Roaming and chaotic behaviors in collisional and photo-initiated molecular-beam reactions: a role of classical vs. quantum nonadiabatic dynamics. Rend. Fis. Acc. Lincei 29, 219–232 (2018). https://doi.org/10.1007/s12210-018-0709-4
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DOI: https://doi.org/10.1007/s12210-018-0709-4