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Updated: Jun 3, 2026

Time-Resolved Fluorescence Anisotropy from Single Molecules for Characterizing Local Flexibility in Biomolecules
Published on: April 25, 2025
Occupancy of rotational population in molecular spectra based on nonextensive statistics
J L Reis1, J Amorim, A Dal Pino
1Departamento de Física, Instituto Tecnológico de Aeronáutica, 12228-900 São José dos Campos, São Paulo, Brazil.
Abstract:
The procedure to obtain gas temperature in plasmas is to fit the experimental rotational spectrum to a theoretical one based on the Boltzmann distribution. For many systems a single distribution fails to account for the occupation of the levels. Researchers have improved the fitting by coupling two distributions and obtaining two distinct temperatures. They assigned the lowest temperature to the gas. Here, we show that these systems should be described by Tsallis nonextensive statistics and its unique associated temperature. Experimental and simulated spectra are tested and excellent agreement is obtained.
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