Abstract
The quantum-classical correspondence in a model four-well potential, exhibiting both first- and second-order saddle points, is analyzed based on Bohm-inspired quantum trajectories whereas the corresponding classical dynamics have been analyzed based on Hamilton’s Equations of Motion. The results indicate that there exists some qualitative correspondence between quantum and classical phase-space dynamics in the intermediate energy regimes. However, at both low and very high energy regimes, the quantum trajectories explore classically forbidden regions in the phase-space. The quantum trajectories attain more ergodic properties than their classical counterparts, particularly at the initial stages of the dynamics, as evidenced by their concerned Lyapunov exponents as well as concerned power spectra of the trajectories. Possible implications of the present simulation study in the context of a model isomerization reaction are also discussed. In the quantum domain, the mechanism for the model isomerization reaction (considered herein) could at best be described as a mixture of concerted and sequential mechanism.
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Acknowledgements
DC thanks SERB, New Delhi (File No. SRG/2022/001280) for the financial assistance. He also thanks the HPC facility of BIT, Mesra, for providing the computational facility. PKC thanks DST, New Delhi, for the J. C. Bose fellowship.
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PKC and DC contributed to the conceptualization of the problem. DC Performed the calculations reported herein. DC wrote the original draft and PKC reviewed/edited it.
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Chakraborty, D., Chattaraj, P.K. A quantum-classical correspondence in the dynamics around higher order saddle points: a Bohmian perspective. Theor Chem Acc 142, 18 (2023). https://doi.org/10.1007/s00214-023-02957-2
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DOI: https://doi.org/10.1007/s00214-023-02957-2