Related Experiment Video
Updated: Jun 22, 2026
10:00
Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
Coherent transfer via environment-induced vibronic resonance
1WPI-Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan. hiroyuki@wpi-aimr.tohoku.ac.jp
The Journal of Chemical Physics
|June 11, 2009
Summary
We reveal how environmental vibrations drive coherent electronic state transfer. This vibronic resonance phenomenon, modulated by low-frequency modes, is key for understanding energy transfer in realistic systems.
Area of Science:
- Quantum dynamics
- Chemical physics
- Spectroscopy
Background:
- Vibronic dynamics govern energy transfer in molecular systems.
- Understanding the interplay between system and environment modes is crucial for controlling quantum processes.
Purpose of the Study:
- To systematically analyze vibronic dynamics involving high-frequency system modes and low-frequency environmental modes.
- To demonstrate how vibronic resonance and environmental dynamics induce coherent transfer between coupled electronic states.
Main Methods:
- Utilized quantum dynamics calculations.
- Analyzed the influence of a high-frequency system mode and low-frequency environmental modes.
- Investigated the modulation of potential energy surfaces by concerted low-frequency mode dynamics.
Main Results:
- Demonstrated coherent transfer between coupled electronic states driven by vibronic resonance.
- Showed that environmental dynamics modulate the potential energy crossing.
- Identified resonance conditions for efficient coherent population transfer.
Conclusions:
- The concerted dynamics of low-frequency modes are essential for modulating potential crossings.
- Vibronic resonance, coupled with environmental dynamics, underlies coherent population transfer.
- This mechanism is relevant for understanding transfer phenomena in various realistic systems.
Related Concept Videos
01:27Inductive Effects on Chemical Shift: Overview
The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
01:04IR Absorption Frequency: Delocalization
Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR spectroscopy,...
In IR spectroscopy,...
01:21IR Absorption Frequency: Hybridization
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that stretch at a...
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that stretch at a...
01:27π Electron Effects on Chemical Shift: Overview
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
01:24IR Spectroscopy: Molecular Vibration Overview
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
01:08NMR Spectroscopy: Spin–Spin Coupling
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...