Quantum Size Effects in Light Absorption Spectra of Magnetite Fine Particles Dispersed in Magnetic Fluids
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概要
- 論文の詳細を見る
Light absorption spectra of magnetite fine particles of about 7 nm in meandiameter dispersed in magnetic fluid were measured as functions of photon energy, E,from 0.5 eV through 1.8 eV and of particles' temperature from 294 K up to 383 K.The light absorption coefficient c< of the particles is smaller than that of the bulkmagnetite. With increasing temperature, cc decreases for E lower than 1.378 eV, but itincreases for E higher than 1.378 eV. In addition, the spectra are shifted towardshigher energy region by 0.136 eV compared with that of the bulk magnetite. If concentration of oscillator strengths on the bottom of 4s band of iron Ton is assumed, theenergy shift can be interpreted in terms of the quantum size effect of the fine particles,and the effective mass of the 4s electron is evaluated to be 0.37 times as much as thatof a bare electron.[quantum size effect, blue shift, light absorption spectra, magnetite fine particle, ll magnetic fluid, 4s-electronl
- 社団法人日本物理学会の論文
- 1991-10-15
著者
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武富 荒
松本油脂製薬
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Takagi H
Univ. Tokyo Tokyo Jpn
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武富 荒
富士電機総研
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Hatano T
The Institute For Solid State Physics The University Of Tokyo
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Miyajima Hideki
Department Of Physics Faculty Of Science And Technology Keio University
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Hashimoto T
Nec Corp. Kanagawa Jpn
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Inaba Nobuyuki
Department Physics Faculty Of Sciences And Technology Keio University:central Lab. Hitachi Ltd.
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Takahashi H
Univ. Tokyo Chiba
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TAKETOMI Susamu
Matsumoto Yushi-Seiyaku Co.Ltd.
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TAKAHASHI Hiromasa
Department of Physics,Faculty of Science and Technology,Keio University
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Taketomi S
Matsumoto Yushi-seiyaku Co.ltd.
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Taketomi Susamu
Development Laboratory Fuji Electric Corporate Research And Development Ltd.
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Taketomi Susamu
R And D Research Staff Fuji Electric Corporate Research And Development Ltd.:matsumoto Yushi-seiyaku
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Taketomi Susamu
R And D Management Service Section Fuji Electric Corporate Research And Development Ltd.
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Taketomi Susamu
Matsumoto Yushi-seiyaku Co. Ltd.
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Takahashi Hiromasa
Department Of Oral And Maxillofacial Surgery Faculty Of Medicine Fukuoka University
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Takahashi Hiroki
Saclay:Russian Research Center "Kurchatov Institute"
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Taketomi Susamu
Matsumoto Yushi-Seiyaku Co. Ltd., Shibukawa-cho, Yao, Osaka 581-0075, Japan
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Takahashi Haruyuki
Saclay:Russian Research Center "Kurchatov Institute"
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Inaba Nobuyuki
Department of Industrial Chemistry, Faculty of Engineering, Ibaraki University
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