Related Experiment Video
Updated: Nov 17, 2025

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
Theoretical Study of Dynamic Stark-Induced π-Electron Rotations in Low-Symmetry Aromatic Ring Molecules beyond the
Hirobumi Mineo1,2, Ngoc-Loan Phan3, Dung-Kiet La3
1Atomic Molecular and Optical Physics Research Group, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam.
Abstract:
The effects of vibrational motions on dynamic Stark-induced π-electron rotations in a low-symmetry aromatic ring molecule are theoretically studied in the adiabatic approximation. We adopt a simplified three-electronic state model with a few vibronic states. A pair of the lowest vibronic states in two electronic excited states is set degenerate by irradiation of two linearly polarized UV lasers. The resultant degenerate state is named the dynamic Stark-induced degenerate vibronic state (DSIDVS). The laser parameters (intensities and central frequencies) are determined under the conditions of DSIDVS formation. The aromatic ring molecules of interest are supposed to belong to the weak coupling case. The analytical expressions for the DSIDVS and coherent angular momentum L(t) are derived in the displaced harmonic oscillator (DHO) model. Two horizontal potential displacements (δ, δ) between the two electronic excited states (α and β) and the ground state are the parameters in the DHO model. The L(t) calculated with δ = δ is characterized by a regular sequence of the angular momentum pulses with a positive (or negative) constant. For a more general case with δ ≠ δ, the regular sequence is broken down because of the contribution of the first excited vibronic state in each electronic state to L(t).
More Related Videos
09:25Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments
Published on: November 1, 2024
09:37Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR
Published on: February 12, 2019
Related Concept Videos
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
π Electron Effects on Chemical Shift: Overview
Frost Circles for Different Conjugated Systems
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
Hückel's Rule Diagram of π MOs: Frost Circle
A Frost circle is constructed by drawing a polygon whose number of edges is equal to the number of carbons of the given cyclic system, with one of the vertices pointing down. Then, a circle is drawn enclosing the polygon so that...
Aromatic Hydrocarbon Anions: Structural Overview
Due to the absence of continuous...