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- W2029558519 abstract "We report the first measurement of the density of states of low-energy vibrational excitations in a disordered solid via single-molecule (SM) spectroscopy. Optical spectra of many single tetra-tert-butylterrylene (TBT) molecules embedded to amorphous polyisobutylene (PIB) as spectral probes were recorded at low temperatures. The T dependences of SM spectral linewidths showed the broad distribution of local frequencies of vibrations under study. The obtained distribution was compared with the Boson peak in pure PIB measured in [R. Inoue, J. Chem. Phys. 95, 5332 (1991)] by neutron scattering. We found that embedding of a small amount of TBT into PIB does not influence markedly on the observed vibrational dynamics. These results prove the local character of low-energy vibrational excitations in glasses and the existence of relationship between these excitations and the Boson peak." @default.
- W2029558519 created "2016-06-24" @default.
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- W2029558519 date "2006-11-03" @default.
- W2029558519 modified "2023-10-11" @default.
- W2029558519 title "Experimental Evidence of the Local Character of Vibrations Constituting the Boson Peak in Amorphous Solids" @default.
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- W2029558519 doi "https://doi.org/10.1103/physrevlett.97.185501" @default.
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