Inelastic neutron scattering study of low energy excitations in polymer thin films

被引：44

作者：

Inoue, R

Kanaya, T ^{[1
]}

Nishida, K

Tsukushi, I

Shibata, K

机构：

[1] Kyoto Univ, Inst Chem Res, Uji, Kyoto 6110011, Japan

[2] Chiba Inst Technol, Narashino, Chiba 2750023, Japan

[3] Japan Atom Energy Res Inst, Tokai, Ibaraki 3191195, Japan

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.95.056102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report inelastic neutron scattering measurements on polystyrene thin films in a glassy state in the meV region. We found in elastic scattering that the mean square displacement < u(2)> decreased with film thickness, and hence the corresponding force constant f increased. In inelastic and quasielastic scattering, we observed the so-called boson peak at around 1.5 meV and the picosecond fast process for the first time in thin films, both of which decreased in intensity with film thickness. These results were discussed in terms of the potential hardening due to the confinement of polymer chains and/or the interfacial dead layer.

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页数：4

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