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Characterizing Rotational Dynamics and Heterogeneity via Single-Molecule Intensity Measurements.

Alec R Meacham¹, Jaladhar Mahato¹, Han Yang¹

¹Department of Chemistry, Columbia University, New York, New York 10027, United States.

The Journal of Physical Chemistry. B

|September 17, 2024

Summary

This summary is machine-generated.

Researchers developed a new method to study molecular rotation in glassy systems using simple intensity fluctuations, improving precision for simultaneous rotational and translational dynamics analysis. This technique enhances single-molecule studies in challenging conditions.

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Area of Science:

Physical Chemistry
Materials Science
Soft Matter Physics

Background:

Dynamic heterogeneity in glassy systems is typically studied using linear dichroism (LD) at the single-molecule level.
LD measurements require specific optical components and can suffer from reduced localization precision due to photon loss.

Purpose of the Study:

To present a novel, simpler method for characterizing single-molecule rotational dynamics in glassy systems.
To enable simultaneous analysis of rotational and translational dynamics by improving localization precision.

Main Methods:

Utilizing intensity fluctuations of fluorescent probe molecules in a wide-field configuration.
Analyzing rotational dynamics without polarizing optical components.
Comparing results with traditional linear dichroism (LD) methods through numerical and experimental validation.

Main Results:

Numerical analysis shows intensity fluctuations yield similar rotational correlation decays as LD, even at low signal-to-noise ratios.
Experimental validation confirms moderate correlation between rotational time scales obtained from both LD and intensity-based methods.
Deviations observed are consistent with dynamic heterogeneity in glassy systems.

Conclusions:

Intensity fluctuation analysis offers an accessible strategy for studying single-molecule rotational dynamics.
This method is advantageous in situations with limited signal or when high localization precision is crucial.
The technique is applicable across various disciplines studying molecular dynamics in glasses.