Abstract
Low temperature dynamics (tunneling and vibrational relaxation) in doped polyisobutylene film has been reinvestigated using 2-pulse incoherent photon echo (2IPE) and compared with single-molecule spectroscopy (SMS) data. It has been shown that in a very wide range of low temperatures the 2IPE gives optical dephasing times which correspond to the narrowest zero-phonon lines of single dye molecules.
Highlights
The new series of photon echo (PE)-measurements were performed using the home-build 2-pulse IPE (2IPE) spectrometer that was constructed originally in the mid of 1990ies [1, 5], and recently reconstructed to achieve modern experimental possibilities [4, 6]
In both experiments [8, 9] the fluorescence excitation spectra of single TBT molecules in thin (0.5 – 1 μm) PIB film were measured by tuning of frequency of narrowband
It is exactly what was observed in the comparative single-molecule spectroscopy (SMS)/PE-studies at T = 2 К [8]
Summary
The new series of PE-measurements were performed using the home-build 2IPE spectrometer that was constructed originally in the mid of 1990ies [1, 5], and recently reconstructed to achieve modern experimental possibilities [4, 6]. We used a thin (0.5 mm) film of PIB with TBT molecules. PIB (Mw= 4.2×106 g·mol–1, Sigma Aldrich) was dissolved in spectrally pure toluene (Sigma Aldrich) together with TBT.
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