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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Laser-field-free molecular orientation.

Akihisa Goban1, Shinichirou Minemoto, Hirofumi Sakai

  • 1Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

Physical Review Letters
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Researchers achieved laser-field-free molecular orientation using electrostatic fields and rapidly switched-off laser pulses. This technique allows molecular orientation to revive after the laser pulse, opening new applications.

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Area of Science:

  • Physical Chemistry
  • Molecular Physics
  • Laser Science

Background:

  • Controlling molecular orientation is crucial for various applications in chemistry and physics.
  • Previous methods often required strong laser fields or complex setups.
  • Achieving laser-field-free orientation presents a significant advancement.

Purpose of the Study:

  • To demonstrate a novel method for achieving laser-field-free molecular orientation.
  • To investigate the revival of molecular orientation after a laser pulse.
  • To explore the potential of this technique for new molecular samples.

Main Methods:

  • Utilizing a combination of a moderate electrostatic field and an intense, rapidly turned-off nonresonant laser field.
  • Employing the plasma shutter technique to shape the laser pulse.
  • Using carbonyl sulfide (OCS) molecules as the sample for orientation.

Main Results:

  • Adiabatic molecular orientation was created during the laser pulse's rising edge.
  • The orientation was observed to revive around the rotational period of OCS molecules.
  • The revived orientation matched the degree of orientation at the laser pulse's peak, in a virtually laser-field-free condition.

Conclusions:

  • A new method for achieving laser-field-free molecular orientation has been successfully demonstrated.
  • The revival of molecular orientation in the absence of a laser field is confirmed.
  • This technique expands the range of molecular samples available for advanced applications.