Moments distributions of single dye molecule spectra in a low-temperature polymer: Analysis of system ergodicity

16th International Youth Scientific School 'Actual Problems of Magnetic Resonance and its Applications'

Anikushina, T.A.^1 ; Naumov, A.V.^1

Institute for Spectroscopy, Russian Academy of Sciences, Troitsk, Russia Moscow State Pedagogical University, 142190, Moscow, 119991, Russia^1

关键词: Low temperature polymers;    Polyisobutylenes;    Single dye molecules;    Spectral evolution;    Standard theories;    Temporal dynamics;    The standard model;    Two-level system;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/478/1/012005/pdf
DOI  :  10.1088/1742-6596/478/1/012005

来源: IOP

【 摘 要 】

This article demonstrates the principal advantages of the technique for analysis of the long-term spectral evolution of single molecules (SM) in the study of the microscopic nature of the dynamic processes in low-temperature polymers. We performed the detailed analysis of the spectral trail of single tetra-tert-butylterrylene (TBT) molecule in an amorphous polyisobutylene matrix, measured over 5 hours at T 7K. It has been shown that the slow temporal dynamics is in qualitative agreement with the standard model of two-level systems and stochastic sudden-jump model. At the same time the distributions of the first four moments (cumulants) of the spectra of the selected SM measured at different time points were found not consistent with the standard theory prediction. It was considered as evidence that in a given time interval the system is not ergodic