Related Experiment Video
Updated: Nov 16, 2025
11:03
An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
8.8K
Theory of dissipation pathways in open quantum systems.
Chang Woo Kim1, Ignacio Franco1
1Department of Chemistry, University of Rochester, Rochester, New York 14627, USA.
The Journal of Chemical Physics
|February 28, 2021
Summary
We developed a new method to break down energy dissipation in open quantum systems by individual bath parts. This technique helps understand and engineer quantum environments.
Area of Science:
- Quantum Dynamics
- Physical Chemistry
- Spectroscopy
Background:
- Understanding energy dissipation in open quantum systems is crucial for controlling quantum phenomena.
- Current methods often lack the ability to attribute dissipation to specific environmental components.
Purpose of the Study:
- To introduce a novel method for decomposing energy dissipation into contributions from individual bath components.
- To enable quantitative analysis of energy flow within complex quantum systems.
Main Methods:
- A vibronic extension of Förster resonance energy transfer (FRET) theory was employed.
- The method was benchmarked against mixed quantum-classical simulations for accuracy assessment.
Main Results:
- The method successfully provides a semi-quantitative, frequency-dependent decomposition of energy dissipation.
- Demonstrated utility using a model donor-acceptor system coupled to a harmonic bath.
Conclusions:
- This approach offers a pathway to identify key bath features responsible for energy dissipation.
- Facilitates a deeper understanding of open quantum system dynamics and environmental engineering.
Related Concept Videos
01:15Theories of Dissolution: Diffusion Layer Model
1.3K
Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
1.3K
01:09Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model
588
Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
588
02:32The de Broglie Wavelength
31.7K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
31.7K
01:10Entropy Change in Reversible Processes
3.0K
In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
3.0K
01:25Deactivation Processes: Jablonski Diagram
1.3K
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
1.3K
02:39Entropy
33.0K
Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
33.0K