Related Experiment Video
Updated: Sep 21, 2025
08:22
Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
7.0K
Not dark yet for strong light-matter coupling to accelerate singlet fission dynamics
Clàudia Climent1, David Casanova2,3, Johannes Feist1
1Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain.
Cell Reports. Physical Science
|May 27, 2022
Summary
Strong light-matter coupling accelerates singlet fission dynamics. This polariton-based approach enhances chemical processes, enabling efficient singlet fission in a wider range of materials.
Area of Science:
- Physical Chemistry
- Materials Science
- Quantum Optics
Background:
- Polaritons are hybrid light-matter states offering novel ways to control chemical reactions.
- Singlet fission is a photophysical process with potential applications in solar energy conversion.
Purpose of the Study:
- To investigate the acceleration of singlet fission dynamics using strong light-matter coupling.
- To explore the role of polaritons in enhancing singlet fission efficiency.
Main Methods:
- Theoretical investigation of singlet fission dynamics under strong coupling conditions.
- Analysis of polariton-molecule interactions in optical cavities.
- Modeling superexchange-mediated singlet fission in non-conventional materials.
Main Results:
- Strong light-matter coupling significantly speeds up singlet fission dynamics.
- Polariton effects dominate when the lower polariton is energetically close to the multiexcitonic state.
- Enhanced singlet fission is observed in materials with large energy gaps, even with broad molecular states.
Conclusions:
- Polaritonics provide a new strategy to enhance singlet fission.
- This approach expands the range of materials suitable for efficient singlet fission.
- Strong coupling offers a robust method for controlling photophysical processes.
Related Concept Videos
02:50Nuclear Fission
10.5K
Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleon—that is, mass numbers and binding energies per nucleon that are closer to the “peak” of the binding energy graph near 56. Sometimes neutrons are also produced. This decomposition of a large nucleus into smaller pieces is called fission. The breaking is rather random with the formation of a large...
10.5K
02:45Nuclear Fusion
31.6K
The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
31.6K
03:18Nuclear Stability
20.3K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
To hold positively charged protons together...
20.3K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.2K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.2K
02:13Nuclear Binding Energy
13.2K
The difference between the calculated and experimentally measured masses is known as the mass defect of the atom. In the case of helium-4, the mass defect indicates a “loss” in mass of 4.0331 amu – 4.0026 amu = 0.0305 amu. The loss in mass accompanying the formation of an atom from protons, neutrons, and electrons is due to the conversion of that mass into energy that is evolved as the atom forms. The nuclear binding energy is the energy produced when the atoms’ nucleons...
13.2K
01:08NMR Spectroscopy: Spin–Spin Coupling
1.7K
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...
1.7K