1991 Fiscal Year Annual Research Report

固体における電子励起誘起原子過程の研究

Research Project

Project/Area Number	62065003
Research Institution	Nagoya University
Principal Investigator	伊藤憲昭名古屋大学, 理学部, 教授 (90022996)
Co-Investigator(Kenkyū-buntansha)	金崎順一名古屋大学, 理学部, 助手 (80204535) 谷村克己名古屋大学, 理学部, 助教授 (00135328) 中井靖男名古屋大学, 理学部, 助教授 (40022719)
Keywords	過度的ラマン散乱装置 / 二重励起分光装置 / レ-ザ-誘起原子放出 / 断熱ポテンシャル曲線 / 電子励起誘起原子過程 / 高密度励起効果 / 欠陥生成 / 表面欠陥
Research Abstract	本研究では次の新しい装置(1.過渡的ラマン散乱装置、2.サブピコ秒二重励起分光装置、3.レ-ザ-誘起原子放出測定装置、4.イオンビ-ム表面解析装置)を試作し、新しい角度から、種々の系における電子励起誘起原子過程を統一的に明らかにすることを目的とする。本年度得られた成果は次の通りである。 1.サブピコ秒レ-ザ-パルスによるハロゲン化アルカリ自己捕獲励起子と欠陥生成実験 KBrとKIについてサブピコ秒レ-ザ-パルスで2光子吸収によって電子・正孔対を生成しそれに続く光吸収変化を観測した。これにより、KIについて最低状態への脱励起後への脱励起が極めて速やかに生じること、また最低状態断熱ポテンシャル曲線の2つの最小値の間の振動を観測した。またKBrについては、振動励起状態での光吸収また非平衡状態から自己捕獲励起子最低状態およびF中心への脱励起を観測した。 2.さらにRbIの自己捕獲励起子共鳴ラマン散乱の測定に成功し、そのハロゲン伸縮振動の周波数がH中心のそれに近いことを示した。この結果と昨年度得たNaClに関する同様の結果を合わせて自己捕獲励起子の原子構造に関する新しいモデルを提案した。 3.レ-ザ-照射による半導体表面からの原子放出GaP表面のレ-ザ-照射により、表面格子欠陥に起因するGa原子の放出の励起スペクトルを求め、表面状態の励起が原子放出に最も有効であることを示した。

Research Products

(15 results)

All Other

All Publications (15 results)

[Publications] T.Sugiyama,K.Tanimura and N.Itoh: "Direct Measurement of Transient Macroscopic Volume Change Induced by Generation of Electron-Hole Pairs in Gap and GaAs" Appl.Phys.Lett.58. 146-148 (1991)
[Publications] J.Valbis and N.Itoh: "Electronic Excitations,Luminescence and Lattice Defect Formation in α-Al_2O_3 Crystals" Radiation Effects and Defect in Solids. 116. 171-189 (1991)
[Publications] Y.Nakai,K.Hattori,A.Okano,N.Itoh and R.Haglund,Jr.: "Non-Thermal Laser Sputtering from Solid Surfaces" Nucl.Instrum.Methods. 58. 452-462 (1991)
[Publications] N.Itoh and T.Tanaka,F.W.Clinard,Jr.: "Formation of Metastable Defects under Irradiation of Ceramics" J.Nucl.Mater.183. 25-32 (1991)
[Publications] K.Hattori,A.Okano,Y.Nakai,N.Itoh and R.F.Haglund,Jr.: "Characterization of Surface Defects by Means of Laser-induced Ga^0 Emission from GaP Surfaces" J.Phys.Condens.Matt.3. 7001-7006 (1991)
[Publications] K.Tanimura and N.Itoh: "Lattice Instability at Excited States of the Self-Trapped Excitons in MgF_2" J.Appl.Phys.69. 7831-7835 (1991)
[Publications] Jai Singh and N.Itoh: "A microscopic approach to the theory of polymer ablation" Chemical Physics (North-Holland). 148. 209-217 (1990)
[Publications] A.L.Shluger,N.Itoh,V.E.Puchin and E.N.Heifets: "Two types of Self-Trapped Excition in Alkali Halide Crystals" Phys.Rev.B.44. 1499-1508 (1991)
[Publications] J.Kanasaki,H.Yamashita,A.Okano,K.Hattori,Y.Nakai,N.Itoh and R.F.Haglund,Jr.: "Effects of oxygen adsorption on laser-induced sputtering from Gap(110)surfaces" Surf.Sci.257. 642-646 (1991)
[Publications] T.Tokizaki,T.Makimura,H.Akiyama,A.Nakamura,K.Tanimura and N.Itoh: "Femtosecond Cascade Excitation spectroscopy for Non-Radiative De-Excitation and Lattice Relaxation of the Self-Trapped Excion in NaCl" Phy.Rev.Lett.67. 2701-2704 (1991)
[Publications] A.Okano,K.Hattori,Y.Nakai and N.Itoh: "Temperature dependence of the laser-induced Ga^0 emission from GaP (110) surface" Surf.Sci.258. 671-675 (1991)
[Publications] C.K.Ong,G.S.Khoo,K.Hattori,Y.Nakai and N.Itoh: "CNDO Calculation of Energies of Ejection of Ga Atom from Defect Site on the GaP (110) Surface" Surf.Sci.259. 787-790 (1991)
[Publications] A.Shluger,N.Itoh and K.Noda: "Mecanisms of Tritium Diffusion in Li_2O:Quantum-chemical Simulation" J.Phys.Condens.Matter. 3. 9895-9906 (1991)
[Publications] K.Tanimura and N.Itoh: "Mollwo-Ivey Relation for the Electron-Transition Energy of the Self-Trapped Excitons in Alkali Halides" Phys.Rev.Lett.in print.
[Publications] Ken Hattori,Akiko Okano,Yasuo Nakai and Noriaki Itoh: "Laser-Induced Electronic Processes on GaP (110) Surfaces: Particle Emission and Ablation Initiated by Defects" Phys.Rev.B in print.

1991 Fiscal Year Annual Research Report

固体における電子励起誘起原子過程の研究

Principal Investigator

伊藤 憲昭 名古屋大学, 理学部, 教授 (90022996)

Research Products

[Publications] T.Sugiyama,K.Tanimura and N.Itoh: "Direct Measurement of Transient Macroscopic Volume Change Induced by Generation of Electron-Hole Pairs in Gap and GaAs" Appl.Phys.Lett.58. 146-148 (1991)

[Publications] J.Valbis and N.Itoh: "Electronic Excitations,Luminescence and Lattice Defect Formation in α-Al_2O_3 Crystals" Radiation Effects and Defect in Solids. 116. 171-189 (1991)

[Publications] Y.Nakai,K.Hattori,A.Okano,N.Itoh and R.Haglund,Jr.: "Non-Thermal Laser Sputtering from Solid Surfaces" Nucl.Instrum.Methods. 58. 452-462 (1991)

[Publications] N.Itoh and T.Tanaka,F.W.Clinard,Jr.: "Formation of Metastable Defects under Irradiation of Ceramics" J.Nucl.Mater.183. 25-32 (1991)

[Publications] K.Hattori,A.Okano,Y.Nakai,N.Itoh and R.F.Haglund,Jr.: "Characterization of Surface Defects by Means of Laser-induced Ga^0 Emission from GaP Surfaces" J.Phys.Condens.Matt.3. 7001-7006 (1991)

[Publications] K.Tanimura and N.Itoh: "Lattice Instability at Excited States of the Self-Trapped Excitons in MgF_2" J.Appl.Phys.69. 7831-7835 (1991)

[Publications] Jai Singh and N.Itoh: "A microscopic approach to the theory of polymer ablation" Chemical Physics (North-Holland). 148. 209-217 (1990)

[Publications] A.L.Shluger,N.Itoh,V.E.Puchin and E.N.Heifets: "Two types of Self-Trapped Excition in Alkali Halide Crystals" Phys.Rev.B.44. 1499-1508 (1991)

[Publications] J.Kanasaki,H.Yamashita,A.Okano,K.Hattori,Y.Nakai,N.Itoh and R.F.Haglund,Jr.: "Effects of oxygen adsorption on laser-induced sputtering from Gap(110)surfaces" Surf.Sci.257. 642-646 (1991)

[Publications] T.Tokizaki,T.Makimura,H.Akiyama,A.Nakamura,K.Tanimura and N.Itoh: "Femtosecond Cascade Excitation spectroscopy for Non-Radiative De-Excitation and Lattice Relaxation of the Self-Trapped Excion in NaCl" Phy.Rev.Lett.67. 2701-2704 (1991)

[Publications] A.Okano,K.Hattori,Y.Nakai and N.Itoh: "Temperature dependence of the laser-induced Ga^0 emission from GaP (110) surface" Surf.Sci.258. 671-675 (1991)

[Publications] C.K.Ong,G.S.Khoo,K.Hattori,Y.Nakai and N.Itoh: "CNDO Calculation of Energies of Ejection of Ga Atom from Defect Site on the GaP (110) Surface" Surf.Sci.259. 787-790 (1991)

[Publications] A.Shluger,N.Itoh and K.Noda: "Mecanisms of Tritium Diffusion in Li_2O:Quantum-chemical Simulation" J.Phys.Condens.Matter. 3. 9895-9906 (1991)

[Publications] K.Tanimura and N.Itoh: "Mollwo-Ivey Relation for the Electron-Transition Energy of the Self-Trapped Excitons in Alkali Halides" Phys.Rev.Lett.in print.

[Publications] Ken Hattori,Akiko Okano,Yasuo Nakai and Noriaki Itoh: "Laser-Induced Electronic Processes on GaP (110) Surfaces: Particle Emission and Ablation Initiated by Defects" Phys.Rev.B in print.

伊藤憲昭名古屋大学, 理学部, 教授 (90022996)