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Title: Low temperature spectral dynamics of single molecules in ultrathin polymer films

We studied the spectral dynamics of single fluorescent dye molecules embedded in ultrathin films (5 – 100 nm) of the amorphous polymer polyisobutylene at cryogenic temperatures and its variation with film thickness. Noticeable portion of molecules in the ensemble shows a behavior which is inconsistent with the standard tunneling model: Their spectral lines are subject to irreversible spectral jumps, continuous shifting, and abrupt chaotic changes of the linewidth or jumping rate. In films thinner than 100 nm, the occurrence of “non-standard” spectral behavior increases with decreasing sample thickness at fixed excitation intensity. In addition, it also increases with laser intensity.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [2] ;  [3]
  1. Institute for Spectroscopy, RAS, Troitsk, Moscow Region 142190 (Russian Federation)
  2. (Russian Federation)
  3. Institute of Physics and BIMF, University of Bayreuth, 95440 Bayreuth (Germany)
Publication Date:
OSTI Identifier:
22304366
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 140; Journal Issue: 20; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; EXCITATION; FLUORESCENCE; MOLECULES; POLYMERS; THIN FILMS; TUNNEL EFFECT