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$Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing$

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Published on: April 25, 2019

Laser-assisted electron diffraction for femtosecond molecular imaging.

Yuya Morimoto¹, Reika Kanya¹, Kaoru Yamanouchi¹

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

The Journal of Chemical Physics

|February 18, 2014

Summary

We observed laser-assisted electron diffraction (LAED) patterns in CCl4 molecules, revealing their structure during laser interaction. This technique offers high temporal and spatial resolution for studying ultrafast molecular dynamics.

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Published on: February 4, 2017

Area of Science:

Physical Chemistry
Molecular Physics
Ultrafast Science

Background:

Understanding molecular structure and dynamics is crucial in chemistry and physics.
Probing ultrafast molecular events requires high temporal and spatial resolution techniques.

Purpose of the Study:

To observe and analyze laser-assisted electron diffraction (LAED) patterns.
To demonstrate LAED's capability in probing ultrafast molecular dynamics.
To investigate the geometrical structure of gas-phase CCl4 molecules under laser irradiation.

Main Methods:

Collision of 1 keV electrons with gas-phase CCl4 molecules.
Interaction with a femtosecond near-infrared laser field.
Analysis of scattered electron angular distribution with energy shifts of ±ℏω.

Main Results:

Observed clear diffraction patterns in the angular distribution of scattered electrons.
Diffraction patterns correlated with energy shifts of ±ℏω.
The observed patterns reflect the geometrical structure of CCl4 molecules at the moment of laser irradiation.

Conclusions:

Laser-assisted electron diffraction (LAED) is a viable technique for studying molecular structure.
LAED provides high temporal resolution (<10 fs) and spatial resolution (∼0.01 Å).
This method enables the investigation of ultrafast nuclear dynamics in molecules.