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Related Concept Videos

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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Solid state-like high harmonic generation from cluster molecules with rotational periodicities.

Yigeng Peng1, Tong Wu1, Guanglu Yuan1

  • 1Institute of Ultrafast Optical Physics, Department of Applied Physics, and MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Nanjing University of Science and Technology, Nanjing 210094, China.

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We demonstrate solid-state-like high harmonic generation (HHG) in cyclo[18]carbon rings using a quasi-band model. This finding links gas and solid HHG physics and offers optical detection of molecular symmetry.

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Area of Science:

  • Quantum Optics
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • High harmonic generation (HHG) in solids is typically explained by band structure derived from translational invariance.
  • Periodic boundary conditions (PBC) also arise from rotational invariance, allowing for analogous Bloch theorem applications.

Purpose of the Study:

  • To develop a quasi-band model for systems with rotational invariance.
  • To investigate solid-state-like HHG in cyclo[18]carbon clusters.
  • To establish a link between HHG in gases and solids.

Main Methods:

  • Development of a quasi-band model for rotational symmetry.
  • Application of Liouville-von Neumann equations.
  • Validation using time-dependent density functional theory (TDDFT) calculations.

Main Results:

  • Prediction of solid-state-like HHG in cyclo[18]carbon.
  • Identification of intraband oscillations and interband transitions as HHG sources.
  • Demonstration of HHG's potential for optically probing molecular symmetry and geometry.

Conclusions:

  • A quasi-band model successfully describes HHG in systems with rotational invariance.
  • Cyclo[18]carbon exhibits solid-state-like HHG, bridging gas and solid-state phenomena.
  • HHG can serve as a tool for characterizing molecular structures.