Related Experiment Video
Updated: Jul 18, 2026
08:57
Optical Trap Loading of Dielectric Microparticles In Air
Published on: February 5, 2017
Ultrafast electron localization dynamics following photo-induced charge transfer
1Department of Chemistry, University of California, Berkeley, CA 94720, USA. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
Science (New York, N.Y.)
|August 11, 2000
Summary
Photoinduced charge transfer in [Ru(bpy)3]2+ involves excited state delocalization followed by ligand localization, influenced by solvent dynamics. This reveals environment-coupled and internal molecular dynamics in charge transfer states.
Area of Science:
- Photochemistry
- Physical Chemistry
- Molecular Dynamics
Background:
- Understanding early-stage molecular dynamics after photo-induced charge transfer is crucial for controlling chemical reactions.
- The behavior of excited states in transition metal complexes like [Ru(bpy)3]2+ is highly sensitive to their environment.
Purpose of the Study:
- To investigate the ultrafast molecular dynamics following photo-induced charge transfer in [Ru(bpy)3]2+.
- To differentiate between solvent-coupled and internal molecular dynamics in excited state evolution.
Main Methods:
- Femtosecond time-resolved absorption anisotropy measurements.
- Utilizing nitrile solutions to study [Ru(bpy)3]2+ (bpy = 2,2'-bipyridine).
Main Results:
- Observed time dependence attributed to excited state delocalization over ligands, followed by charge localization onto a single ligand.
- Proposed coupling of the localization process to nondiffusive solvation dynamics.
- Spectral evolution related to wave packet motion on the excited state surface was found to be solvent-independent.
Conclusions:
- The evolution of charge transfer states involves two distinct contributions: one strongly coupled to the surrounding solvent and another governed by internal molecular potentials.
- These findings provide insights into the fundamental processes governing excited-state dynamics in transition metal complexes.
More Related Videos
Related Concept Videos
01:29Induced Electric Dipoles
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
01:19Drift Velocity
The high speed of electrical signals results from the fact that the force between charges acts rapidly at a distance. Thus, when a free charge is forced into a wire, the incoming charge pushes other charges ahead due to the repulsive force between like charges. These moving charges move the charges farther down the line. The density of charge in a system cannot easily be increased, so the signal is passed on rapidly. The resulting electrical shock wave moves through the system at nearly the...
01:30Electromagnetic Waves
James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws of electricity and...
01:25Magnetic Field due to Moving Charges
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
01:30Electronic Distance Measuring Instruments
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...