Femtosecond electron diffraction: Preparation and characterization of (110)-oriented bismuth films
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説明
Here, we present a new approach to synthesize (110)-oriented ultrathin membranes of bismuth (Bi). This rather exotic orientation was achieved by directing the growth through rationale control of lattice matching. Bi films were hetero-epitaxially grown on the (100)-surface of freshly cleaved potassium chloride crystals. The sample orientation was characterized by x-ray and electron diffraction. In addition, high quality free-standing films were obtained after dissolution of the substrate in water and controlled evaporation. Femtosecond electron diffraction (FED) was, therefore, used to monitor the coherent shear acoustic phonons in (110)-oriented free-standing Bi films produced by impulsive femtosecond optical excitation. The small de Broglie wavelength (flat Ewald sphere) of keV-electrons combined with an off-Bragg detection scheme provided a magnified view of shear atomic motions, i.e., lattice distortions in the transverse direction. All-optical pump-probe experiments are usually insensitive to shear displacements, a fact that makes FED a unique non-contact method to achieve the complete characterization of elastic properties of nanoscale materials.
収録刊行物
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- JOURNAL OF APPLIED PHYSICS
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JOURNAL OF APPLIED PHYSICS 111 (4), 043504-, 2012-02-15
American Institute of Physics
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詳細情報 詳細情報について
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- CRID
- 1050282810716608000
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- NII論文ID
- 120004920373
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- NII書誌ID
- AA00693547
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- ISSN
- 00218979
- 10897550
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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