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Related Concept Videos

Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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Deactivation Processes: Jablonski Diagram01:25

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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...
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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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IR Spectroscopy: Molecular Vibration Overview01:24

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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.
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Mass Spectrometry: Molecular Fragmentation Overview01:20

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The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
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Updated: Dec 8, 2025

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Intermolecular vibrations mediate ultrafast singlet fission.

Hong-Guang Duan1,2,3, Ajay Jha1, Xin Li4

  • 1Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.

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|September 19, 2020
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Singlet fission converts one singlet exciton into two triplet excitons in organic semiconductors. Coherent vibrations drive this ultrafast process, enhancing solar energy potential.

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Area of Science:

  • Organic semiconductors
  • Photovoltaics
  • Exciton dynamics

Background:

  • Singlet fission enhances solar energy conversion by exceeding the Shockley-Queisser limit.
  • It involves converting one singlet exciton into two triplet excitons.

Purpose of the Study:

  • Investigate the primary steps of singlet fission in pentacene films.
  • Elucidate the role of coherent vibrational dynamics in the singlet fission process.

Main Methods:

  • Transient Grating (TG) spectroscopy
  • 2D electronic spectroscopy
  • Quantum chemical calculations
  • Nonadiabatic dynamics simulations

Main Results:

  • Coherent vibrational dynamics induce ultrafast transition from singlet to triplet-pair states.
  • Multidimensional conical intersections facilitate this transition.
  • Vibronic coupling to intermolecular rocking modes is crucial for exciton transfer.

Conclusions:

  • Vibrational dynamics and conical intersections are key to ultrafast singlet fission.
  • This mechanism offers a new pathway for efficient exciton transfer in organic solar cells.