高分解能レーザ光電子分光装置の開発と金属ナノ構造体励起量子化電子状態の研究

• Project/Area Number: 15684006
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics I
• Research Institution: Kobe University (2004-2005); Tohoku University (2003)
• Principal Investigator: 田中 章順 神戸大学, 工学部, 助教授 (40250667)
• Project Period (FY): 2003 – 2005
• Project Status: Completed (Fiscal Year 2005)
• Budget Amount: ¥30,810,000 (Direct Cost: ¥23,700,000、Indirect Cost: ¥7,110,000); Fiscal Year 2005: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2004: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000); Fiscal Year 2003: ¥22,490,000 (Direct Cost: ¥17,300,000、Indirect Cost: ¥5,190,000)
• Keywords: レーザ光電子分光 / 時間分解2光子光電子分光 / 金属ナノ構造体 / 励起ダイナミクス

Research Abstract

本研究では、まず第1にフェムト秒超短パルスレーザを励起光源とした高(エネルギー、時間、角度)分解能時間分解・角度分解2光子光電子分光装置を開発することを目的とした。そして分子線エピタキシー(MBE)法により作製した金属人工格子の最小構成単位である遷移金属基板上の貴金属ナノ薄膜についての角度分解2光子光電子分光測定より、フェルミレベル直上に発現する非占有量子化電子構造の詳細について明らかにし、これらの非占有量子化電子準位を中間励起状態にした時間分解・角度分解2光子光電子分光により、量子状態(エネルギーE、運動量k)分解した金属ナノ薄膜構造における励起電子ダイナミクスを明らかにすることを第2の目的とした。本年度は昨年度までにほぼ構築した高分解能時間分解・角度分解光電子分光装置の改良、調整を引き続き行い、それらの装置を用いて、当初の計画通りMBE法により系統的に作製した遷移金属基板上の貴金属ナノ薄膜について、それらの非占有量子化電子構造及び励起電子ダイナミクスの直接観測を現在行っている。また通常の実験室光源を用いた角度分解光電子分光により、上記と同様の貴金属ナノ薄膜に発現するフェルミ準位近傍の占有量子化電子構造の詳細(量子化準位のエネルギー固有値及びそれらの膜厚依存性、基板電子構造との混成効果)について明らかにした。これらの実験結果は現在考察を行っている励起電子ダイナミクス、とりわけ電子-電子散乱過程を議論する上でリファレンスとなる。

Research Products

• [Journal Article] Passivant dependence of nanoparticle-substrate interaction on alkanethiolate-passivated Au nanoparticles on graphite substrates (2006)
  • Author(s): M.Imamura
  • Journal Title: Physical Review B 73(印刷中)(2006年3月)
• [Journal Article] Femtosecond time-resolved two-photon photoemission study of organic semiconductor copper phthalocyanine film (2005)
  • Author(s): A.Tanaka
  • Journal Title: Journal of Electron Spectroscopy and Related Phenomena 144-147 Pages: 327-329
  • NAID: 120000944239
• [Journal Article] Quantum phenomena in surface-passivated metallic nanoparticles studied by photoelectron spectroscopy (2005)
  • Author(s): A.Tanaka
  • Journal Title: Transactions of the Materials Research Society of Japan 30 Pages: 565-570
• [Journal Article] Photoemission study of alkanethiolate-passivated Au nanoparticles prepared by digestive ripening process (2005)
  • Author(s): M.Imamura
  • Journal Title: Transactions of the Materials Research Society of Japan 30 Pages: 537-540
• [Journal Article] Growth and electronic structure of Ag nanofilms on Fe(110) substrates (2005)
  • Author(s): H.Sasaki
  • Journal Title: Thin Solid Films 489 Pages: 350-353
• [Journal Article] Surface-passivants dependence of photoemission spectra of alkanethiolate-passivated Au nanoparticles on the HOPG substrates (2005)
  • Author(s): A.Tanaka
  • Journal Title: UVSOR Activity Report 32 Pages: 105-105
• [Journal Article] Femtosecond dynamic final-state effect in photoemission of surface-passivated metallic nanoparticles on graphite substrates (2004)
  • Author(s): A.Tanaka
  • Journal Title: Applied Surface Science 237 Pages: 537-542
  • NAID: 120000944563
• [Journal Article] X-ray photoemission study of dodecanethiolate-passivated Ag nanoparticles (2004)
  • Author(s): A.Tanaka
  • Journal Title: Journal of Physical Society of Japan 73 Pages: 1543-1546
  • NAID: 110001974417
• [Journal Article] Comparative angle-resolved photoemission study of Ag nanometer films grown on fcc Fe(111) and bcc Fe(110) (2004)
  • Author(s): H.Sasaki
  • Journal Title: Physical Review B 70
• [Journal Article] Angle-resolved photoemission study of CoSi_2 nanofilms grown on Si(111) substrates (2004)
  • Author(s): H.Sasaki
  • Journal Title: Solid State Communications 129 Pages: 91-95
• [Journal Article] Angle-resolved photoemission study of Ag nanofilms grown on fcc transition-metal(111) substrates (2004)
  • Author(s): H.Sasaki
  • Journal Title: Solid State Communications 132 Pages: 719-724
• [Journal Article] Dynamic final-state effect on the core-level photoemission of surface-passivated Au nanoparticles on the graphite substrates (2004)
  • Author(s): A.Tanaka
  • Journal Title: UVSOR Activity Report 31 Pages: 85-85
• [Book] 放射光科学入門 (2004)
  • Author(s): 田中 章順(共著)
  • Total Pages: 373
  • Publisher: 東北大学出版会
• [Publications] A.Tanaka: "Hot-electron relaxation in layered semiconductor 2H-MoS_2 studied by time-resolved_two-photon_photoemission_spectroscopy"Physical Review B. 67. 113315-1-113315-4 (2003)
• [Publications] A.Tanaka: "Dynamic final-state nanoparticle-substrate interaction in the photoemission of dodecanethiolate-passivated Ag nanoparticles on graphite substrates"Physical Review B. 67. 033101-1-033101-4 (2003)
• [Publications] A.Tanaka: "Chemical states of dodecanethiolate-passivated Au nanoparticles : Synchrotron-radiation photoelectron spectroscopy"Solid State Communications. 126. 191-196 (2003)
• [Publications] A.Tanaka: "Electronic coupling of quantum-well states in double Ag nanofilm structures"Journal of Physical Society of Japan. 72. 879-883 (2003)
• [Publications] A.Tanaka: "Photoemission study of metallic nanoparticles passivated by dodecanethiolates : Silver nanoparticles"Surface Science. 532-535. 281-286 (2003)
• [Publications] A.Tanaka: "Femrosecond nanoparticle-substrate interaction in the photoemission final-state of surface-passivated metallic nanoparticles on graphite substrates"Transactions of the Materials Research Society of Japan. 28. 919-922 (2003)
• [Publications] A.Tanaka: "Dynamic final-state effect on the Au 4f core-level photoemission of dodecanethiolate-passivated Au nanoparticles on graphite substrates"Physical Review B. 68. 195415-1-195415-5 (2003)