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Related Concept Videos

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
Rotation with Constant Angular Acceleration - I01:37

Rotation with Constant Angular Acceleration - I

If angular acceleration is constant, then we can simplify equations of rotational kinematics, similar to the equations of linear kinematics. This simplified set of equations can be used to describe many applications in physics and engineering where the angular acceleration of a system is constant.
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Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
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Rotational Motion about a Fixed Axis01:26

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A rigid body's rotation around a fixed axis makes every point within it trace a circular path around a specific line or point. The term given to this type of spinning is defined by the angular position, symbolized by the angle θ. This angle is gauged from a static reference line to the revolving object. From this angular position, any variation is referred to as angular displacement, denoted by dθ. The extent of this displacement can be calculated in degrees, radians, or revolutions, where one...
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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Updated: Jul 2, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

How to quantify long-time rotational motion in molecular systems.

Romain Simon1, Hadrien Bobas2, François Villemot2

  • 1Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, 34095 Montpellier, France.

The Journal of Chemical Physics
|July 1, 2026
PubMed
Summary
This summary is machine-generated.

Existing methods fail to accurately quantify complex rotational motion in molecular fluids, especially near the glass transition. A new empirical method successfully captures these dynamics, resolving literature inconsistencies and enabling better characterization of supercooled liquids.

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Area of Science:

  • Physical Chemistry
  • Soft Matter Physics
  • Computational Materials Science

Background:

  • Quantifying rotational motion in molecular fluids is crucial for understanding material properties.
  • Existing methods exhibit limitations with complex dynamics like slow, heterogeneous, or intermittent motion.
  • This is particularly relevant for supercooled liquids near the glass transition.

Purpose of the Study:

  • To identify limitations of current methods for analyzing rotational dynamics.
  • To develop a novel, accurate method for quantifying complex rotational motion.
  • To resolve inconsistencies in the literature regarding rotational dynamics in supercooled fluids.

Main Methods:

  • Review and critique of existing techniques for measuring rotational dynamics.
  • Development and introduction of a new empirical method.
  • Benchmarking the new method using continuous-time random walk models for rotational dynamics.

Main Results:

  • Established severe limitations of current methods for complex rotational dynamics.
  • Demonstrated the efficacy of the new empirical method in accurately quantifying rotational motion.
  • Showcased the method's ability to capture free, caged, non-Gaussian, and non-Fickian rotational dynamics.

Conclusions:

  • The developed empirical method overcomes limitations of existing techniques.
  • This advancement allows for a more accurate characterization of dynamic heterogeneity in supercooled molecular fluids.
  • The findings are expected to impact studies on the glass transition and the Debye-Stokes-Einstein relation.