Inelastic neutron scattering study of low-energy excitations in vapor-deposited glassy propylene

We have developed a novel cryostat in which glassy states of molecular substances are formed by deposition of their vapor on a cold substrate. The glassy samples are subjected to in situ inelastic neutron scattering experiments. By the use of this cryostat, the glassy state of propylene(CH2=CHCH3) prepared at 20 K was examined on an inverted geometry time-of-flight neutron spectrometer in the energy range below 10 meV. The measurement was performed also on the glassy sample annealed at the glass transition temperature (55 K). A broad excitation peak (boson peak) was found at around 3 meV in the S(2θ,ω) spectra of the as-deposited and annealed samples. The absolute densities of vibrational states G(ω) were derived by combining the neutron spectra and the heat capacity data of a similar compound 1-butene (CH2=CHCH2CH3). The number of vibrational modes associated with the low-energy excitation was 1.64 per molecule for the as-deposited sample and 1.34 for the annealed sample. The boson peak energy depends on...

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