We detail several interesting features in the dynamics of an equilaterally shaped electronic excitation-transfer (EET) trimer with distance-dependent intermonomer excitation-transfer couplings. In the absence of electronic-vibrational coupling, symmetric and antisymmetric superpositions of two single-monomer excitations are shown to exhibit purely constructive, oscillatory, and purely destructive interference in the EET to the third monomer, respectively. In the former case, the transfer is modulated by motion in the symmetrical framework-expansion vibration induced by the Franck–Condon excitation. Distortions in the shape of the triangular framework degrade that coherent EET while activating excitation transfer in the latter case of an antisymmetric initial state. In its symmetrical configuration, two of the three single-exciton states of the trimer are degenerate. This degeneracy is broken by the Jahn–Teller-active framework distortions. The calculations illustrate closed, approximately circular pseudo-rotational wave-packet dynamics on both the lower and the upper adiabatic potential energy surfaces of the degenerate manifold, which lead to the acquisition after one cycle of physically meaningful geometric (Berry) phases of π. Another manifestation of Berry-phase development is seen in the evolution of the vibrational probability density of a wave packet on the lower Jahn–Teller adiabatic potential comprising a superposition of clockwise and counterclockwise circular motions. The circular pseudo-rotation on the upper cone is shown to stabilize the adiabatic electronic state against non-adiabatic internal conversion via the conical intersection, a dynamical process analogous to Slonczewski resonance. Strategies for initiating and monitoring these various dynamical processes experimentally using pre-resonant impulsive Raman excitation, short-pulse absorption, and multi-dimensional wave-packet interferometry are outlined in brief.
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Dynamics of an excitation-transfer trimer: Interference, coherence, Berry’s phase development, and vibrational control of non-adiabaticity
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28 March 2023
Research Article|
March 24 2023
Dynamics of an excitation-transfer trimer: Interference, coherence, Berry’s phase development, and vibrational control of non-adiabaticity
Special Collection:
Celebrating 25 Years of Two-dimensional Infrared (2D IR) Spectroscopy
Jeffrey A. Cina
Jeffrey A. Cina
a)
(Conceptualization, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Writing – original draft, Writing – review & editing)
Department of Chemistry and Biochemistry, Oregon Center for Optical, Molecular, and Quantum Science, University of Oregon
, Eugene, Oregon 97403, USA
a)Author to whom correspondence should be addressed: cina@uoregon.edu
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a)Author to whom correspondence should be addressed: cina@uoregon.edu
Note: This paper is part of the JCP Special Topic on Celebrating 25 Years of Two-Dimensional Infrared (2D IR) Spectroscopy.
J. Chem. Phys. 158, 124307 (2023)
Article history
Received:
December 18 2022
Accepted:
February 28 2023
Citation
Jeffrey A. Cina; Dynamics of an excitation-transfer trimer: Interference, coherence, Berry’s phase development, and vibrational control of non-adiabaticity. J. Chem. Phys. 28 March 2023; 158 (12): 124307. https://doi.org/10.1063/5.0139174
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