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Related Experiment Video

Updated: Jan 5, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

How to control single-molecule rotation.

Grant J Simpson¹, Víctor García-López², A Daniel Boese³

¹Department of Physical Chemistry, University of Graz, Heinrichstrasse 28, 8010, Graz, Austria.

Nature Communications

|October 13, 2019

Summary

This summary is machine-generated.

Precisely orient single dipolar molecules using scanning tunneling microscope electric fields. A specific oxygen-surface interaction creates a pivot point, enabling controlled rotation and mapping of molecular dipole moments.

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Area of Science:

Surface Science
Molecular Physics
Nanotechnology

Background:

Molecular orientation is critical for chemical reactions and material properties.
Precise control over individual molecules is a key goal in nanoscience.

Purpose of the Study:

To demonstrate precise orientation control of single dipolar molecules using electric fields.
To investigate the role of surface interactions in molecular rotation.
To enable spatial mapping of molecular dipole moments.

Main Methods:

Utilized a scanning tunneling microscope (STM) to apply localized electric fields.
Investigated single dipolar molecules adsorbed on a Ag(111) surface.
Manipulated molecular rotation directionality and observed the effect of interlayers.

Main Results:

Achieved precise orientation control of single dipolar molecules with 100% directionality.
Identified a specific oxygen-surface interaction on Ag(111) as the cause of a fixed rotation pivot point.
Demonstrated that disrupting the oxygen-surface interaction (e.g., with a silver atom interlayer) eliminates the pivot point and directional control.

Conclusions:

The study establishes a method for highly precise molecular orientation control.
Highlights the crucial role of specific atom-surface interactions in dictating molecular behavior at the nanoscale.
Provides a pathway for spatially mapping internal dipole moments of individual molecules.