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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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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Probing multiphoton light-induced molecular potentials.

M Kübel1,2,3, M Spanner4, Z Dube4

  • 1Joint Attosecond Science Laboratory, National Research Council and University of Ottawa, 100 Sussex Drive, Ottawa, ON, K1A 0R6, Canada. Matthias.kuebel@uni-jena.de.

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|May 24, 2020
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Summary
This summary is machine-generated.

Intense laser fields create light-induced molecular potentials, altering chemical reactions. Researchers observed modulated proton distributions in H2+ dissociation, revealing ultrafast dynamics controlled by laser properties.

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Area of Science:

  • Quantum Chemistry
  • Molecular Dynamics
  • Laser Physics

Background:

  • Strong laser fields couple with molecular valence electrons, distorting potential energy surfaces.
  • This coupling influences nuclear motion and chemical reaction pathways.
  • Light-induced conical intersections emerge due to angle-dependent coupling strength.

Purpose of the Study:

  • To demonstrate complex light-induced potential energy surfaces governing molecular behavior.
  • To investigate ultrafast dynamics in laser-induced molecular dissociation.
  • To explore the manipulation of molecular dissociation using tailored laser fields.

Main Methods:

  • Experimental measurement of proton angular distributions in H2+ dissociation.
  • Theoretical analysis using two-color Floquet theory.
  • Modeling light-induced potential energy surfaces shaped by laser field parameters.

Main Results:

  • Observed strongly modulated angular distributions of protons from H2+ dissociation, a novel finding.
  • Showed that these modulations arise from ultrafast dynamics on light-induced potentials.
  • Confirmed that laser field amplitude, duration, and phase shape these potentials.

Conclusions:

  • Multiphoton couplings generate complex light-induced potentials that control molecular dynamics.
  • Laser-shaped potentials allow for precise manipulation of molecular dissociation.
  • Ultrafast dynamics on these engineered potentials govern observed phenomena.