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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Nuclear Fission02:50

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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...
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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
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The Collision Theory
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Phase Transitions: Melting and Freezing02:39

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:
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Updated: Nov 29, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Temperature effects on singlet fission dynamics mediated by a conical intersection.

Kewei Sun1, Quan Xu1, Lipeng Chen2

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Elevated temperatures accelerate singlet fission in crystalline rubrene by enhancing excitonic transfer. Temperature also significantly alters 2D electronic spectra due to dephasing and increased accessible eigenstates.

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Area of Science:

  • * Physical Chemistry
  • * Materials Science
  • * Quantum Dynamics

Background:

  • * Singlet fission is a crucial photophysical process for enhancing solar cell efficiency.
  • * Understanding temperature effects on singlet fission in organic materials like rubrene is vital for device optimization.
  • * Conical intersections play a key role in mediating ultrafast excited-state dynamics.

Purpose of the Study:

  • * To investigate the finite-temperature dynamics of singlet fission in crystalline rubrene.
  • * To explore how temperature influences excitonic population transfer and the overall singlet fission rate.
  • * To analyze temperature-dependent changes in two-dimensional electronic spectroscopy (2DES) signals.

Main Methods:

  • * Employed the Dirac-Frenkel time-dependent variational method.
  • * Utilized multiple Davydov D2 trial states for accurate wavefunction representation.
  • * Extended the method to include number state propagation with Boltzmann distribution for thermal initialization (0 K to 300 K).

Main Results:

  • * Higher temperatures were found to facilitate excitonic population transfer.
  • * Elevated temperatures accelerate the singlet fission process in crystalline rubrene.
  • * Simulated 2DES signals showed dramatic changes with increasing temperature, attributed to electronic dephasing and more accessible eigenstates.

Conclusions:

  • * Temperature significantly impacts the dynamics of singlet fission in crystalline rubrene.
  • * The study provides insights into temperature-dependent spectral features, crucial for understanding and controlling photophysical processes.
  • * Findings contribute to the development of more efficient organic electronic devices through precise control of excited-state dynamics.