| Project/Area Number |
25620017
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Physical chemistry
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| Research Institution | Kyushu University |
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Principal Investigator |
TERASAKI Akira 九州大学, 理学(系)研究科(研究院), 教授 (60222147)
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| Co-Investigator(Renkei-kenkyūsha) |
ARAKAWA Masashi 九州大学, 大学院理学研究院, 助教 (10610264)
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| Research Collaborator |
ITO Tomonori
TOBITA Kenichiro
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 金属クラスター / 銀 / 吸収スペクトル / 光解離 / 電子遷移 / 光学応答 |
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| Outline of Final Research Achievements |
Metal particles exhibit size-dependent features in their optical absorption spectra; an atom shows rich structures in the spectrum originating from single-electron transitions between atomic orbitals, whereas a nanoparticle is characterized by a broad spectrum due to collective excitation of electrons by surface-plasmon resonance. This project focused on elucidation of the change in the character of transitions from single-electron to collective excitation as the particle grows from an atom to clusters, and further to nanoparticles. Photodissociation-action spectroscopy was performed to measure optical absorption spectra of size-selected silver cluster ions (Agn+) in the size range from n = 2 to 35. The spectra below n = 25 showed sharp peaks indicating a single-electron behavior, whereas those of larger sizes were broadened to a structure-less profile, which implies breakup of single-electron excitation at n > 25 toward surface-plasmon resonance of silver nanoparticles.
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