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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Related Experiment Video

Updated: Apr 28, 2026

AC Electrokinetic Phenomena Generated by Microelectrode Structures
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Electric deflection of rotating molecules.

E Gershnabel1, I Sh Averbukh

  • 1Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel. erez.gershnabel@weizmann.ac.il

The Journal of Chemical Physics
|February 10, 2011
PubMed
Summary

We present a theory for controlling molecular deflection using electric fields and laser pulses. This method allows for precise manipulation, enabling applications in molecular focusing and trapping.

Area of Science:

  • Molecular physics
  • Quantum mechanics
  • Laser-matter interactions

Background:

  • Inhomogeneous electric fields can deflect rotating molecules.
  • Controlling molecular trajectories is crucial for applications like molecular guiding and trapping.

Purpose of the Study:

  • To develop a theoretical framework for the deflection of polar and nonpolar rotating molecules by static electric fields.
  • To investigate the control of molecular deflection using femtosecond laser pulses.
  • To analyze rainbow-like features in molecular scattering.

Main Methods:

  • Classical and quantum mechanical treatments of molecular rotation in electric fields.
  • Analysis of angular distributions of scattered molecules.
  • Modeling the interaction of molecules with intense femtosecond laser pulses.

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Related Experiment Videos

Last Updated: Apr 28, 2026

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Spatial Separation of Molecular Conformers and Clusters
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Spatial Separation of Molecular Conformers and Clusters

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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
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Main Results:

  • Detailed analysis of rainbow features in molecular deflection patterns.
  • Demonstration of efficient control over molecular deflection using laser pulses.
  • Ability to switch off deflection and reduce angular dispersion via laser excitation.
  • Classical and quantum mechanical models yield consistent conclusions.

Conclusions:

  • A controllable method for molecular deflection using electric fields and laser pulses is established.
  • The proposed scheme offers precise control over molecular trajectories.
  • This research opens avenues for advanced applications in molecular focusing, guiding, and trapping.