Inelastic neutron scattering study of low energy excitations in glassy 1-butene

被引:42
作者
Yamamuro, O
Matsuo, T
Takeda, K
Kanaya, T
Kawaguchi, T
Kaji, K
机构
[1] OSAKA UNIV,FAC SCI,DEPT CHEM,TOYONAKA,OSAKA 560,JAPAN
[2] OSAKA UNIV,FAC SCI,MICROCALORIMETRY RES CTR,TOYONAKA,OSAKA 560,JAPAN
[3] NARUTO UNIV EDUC,DEPT CHEM,NARUTO,TOKUSHIMA 772,JAPAN
[4] KYOTO UNIV,INST CHEM RES,UJI,KYOTO 611,JAPAN
关键词
D O I
10.1063/1.471928
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Glassy 1-butene (CH2=CHCH2CH3) was studied by incoherent inelastic neutron scattering below 10 meV in the temperature range 18 less than or equal to T less than or equal to 80 K covering the glass transition temperature (T-g = 60 K). A broad excitation peak due to the low-energy excitation was found at 3-4 meV. The spectra corrected for the Bose factor could be scaled to a unique curve for temperatures below T-g. The absolute density of vibrational states was derived from the spectrum at 18 K and the previously measured heat capacity data. The number of vibrational states associated with the low energy excitation was 1.4 per molecule. This is much larger than those for SiO2 and other amorphous materials studied so far. The density of vibrational states was well reproduced by the soft potential model originally conceived for network glasses. (C) 1996 American Institute of Physics.
引用
收藏
页码:732 / 737
页数:6
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