# Direct observation of molecular cooperativity near the glass transition

Source: [Direct observation of molecular cooperativity near the glass transition](<https://www.sota2.com/research/paper/68fa332f1e209131ce88ddd6>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T19:54:31.843Z

Authors: E. Vidal Russell, N. E. Israeloff

Published: 2000-12-13T22:07:11.000Z

## Abstract

We describe direct observations of molecular cooperativity near the glass transition in poly-vinyl-acetate (PVAc), through nanometer-scale probing of dielectric fluctuations. Molecular clusters switched spontaneously between two to four distinct configurations, producing complex random-telegraph-signals (RTS). Analysis of the RTS and their power spectra shows that individual clusters exhibit both transient dynamical heterogeneity and non-exponential kinetics.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/cond-mat/0012245>)

[PDF](<https://arxiv.org/pdf/cond-mat/0012245.pdf>)