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Updated: Mar 31, 2026
10:52
Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
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State-Specific Collision Dynamics of Molecular Super Rotors with Oriented Angular Momentum
Matthew J Murray1, Hannah M Ogden1, Carlos Toro1
1Department of Chemistry and Biochemistry, University of Maryland , College Park, Maryland 20742, United States.
The Journal of Physical Chemistry. A
|October 16, 2015
Summary
An optical centrifuge excites carbon dioxide molecules to ultrahigh rotational states (super rotors). Collisions redistribute energy, showing increased translational energy and altered rotational populations, impacting collision dynamics.
Area of Science:
- Molecular dynamics
- Physical chemistry
- Spectroscopy
Background:
- Optical centrifuges can induce extreme molecular rotation.
- Understanding energy transfer in molecular collisions is crucial.
Purpose of the Study:
- To investigate the dynamics of ultrahigh rotational states in carbon dioxide molecules.
- To analyze energy transfer and population changes during super rotor collisions.
Main Methods:
- High-resolution transient infrared absorption spectroscopy.
- Time-evolution measurements of translational and rotational energy.
- Quantum scattering calculations for Ar-CO2 collisions.
Main Results:
- Carbon dioxide molecules were driven to ultrahigh rotational states (≈32 THz).
- Super rotor collisions resulted in significant translational energy and altered rotational populations (J=36, 54, 76 increased).
- Collision cross sections increased with decreasing collision energy for super rotors.
Conclusions:
- Collision dynamics of super rotors are complex, involving energy redistribution.
- High rotational states are short-lived, indicating rapid relaxation.
- Experimental and computational results provide insights into super rotor dynamics.
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