1990 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)	中村新男名古屋大学, 工学部, 助教授 (50159068) 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	過渡的ラマン散乱装置 / 二重励起分光装置 / レ-ザ-誘起原子放出 / 電子励起誘起原子過程 / 断熱ポテンシャル曲線 / 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。これらの装置のうち4については、最終調整の段階であるが、他はすでに稼動始めている。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の二重励起実験 NaClの自己捕獲励起子をサブピコ秒レ-ザ-パルスで励起し、それに続く光吸収変化を観測することに成功した。これにより、最低状態への脱励起後に生じる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、またその振動の途中で格子欠陥が生成することを見付けた。 2、種々のハロゲン化アルカリのV_k中心、H中心のラマン散乱の測定を行い、両中心のハロゲン伸縮振動周波数が著しく異なることを示した。さらにNaClの自己捕獲励起子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。この結果は、自己捕獲励起子の原子構造の従来のモデルに再検討が必要であることを示唆するものである。 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原子およびGa^+イオンの放出を検出した。この事実はレ-ザ-誘起原子放出は、表面欠陥のキャラクタリゼ-ションとその除去に有用であることを示す。

Research Products

(18 results)

All Other

All Publications (18 results)

[Publications] C.Itoh,K.Tanimura,N.Itoh and M.Itoh: "Threshold Energy for Photogeneration of SelfーTrapped Excitons in SiO_2." Phys.Rev.B. 39. 11183-11186 (1989)
[Publications] T.Sugiyama,K.Tanimura and N.Itoh: "RecombinationーInduced MetastableーtoーStable Transformation of the EL2 Center in GaAs Induced by ElectronーHole Recombination in preparation." Appl.Phys.Let.55. 639-641 (1989)
[Publications] T.Shimizu,T.Fujita and N.Itoh: "Evidence for SolidーPhase Migration of Si Atoms in LaserーIrradiation Si^+ーImplanted SiO_2" J.Phys.C. 1. 5521 (1989)
[Publications] J.Singh,N.Itoh,and V.V.Truong: "Influence of ExcitonーExciton Interaction with Spin Paired Charge Carriers and ExcitonーLattice Interaction on the Surface Properties of Crystalline Solids" Applied Physics A. 49. 631-639 (1989)
[Publications] K.Hattori,Y.Nakai and N.Itoh: "Laser Sputtering as a Tool of Investigating Surface Optical Transitions" Surf.Sci.227. 115 (1990)
[Publications] K.Tanimura and N.Itoh: "Relaxation of Excitons Perturbed by SelfーTrapped in RbI:Evidence for Exciton Fusion in Inorganic Solids with Strong ElectronーLattice Coupling" Phys.Rev.Lett.64. 1429 (1990)
[Publications] Y.Nakai,K.Hattori and N.Itoh: "Studies of Laser Sputtering of GaP by Means of Resonance Ionization Spectroscopy:Response of Clean Solid Surfaces to PhotoーExcitation" Desorption Induced by Electronic Transitions(Springer Verlag,Berlin,1990). 5. 143 (1990)
[Publications] A.Shluger and N.Itoh: "Models of Electronic defects and SelfーTrapped Excitons in Li_2O" Phil.Mag.in print.
[Publications] N.Matsunami,K.Kitoh,J.Kanasaki and N.Itoh: "HighーResolution Analysis of Protons Scattered from Solid Surfaces" Nuclear Instruments and Methods in Physics Research. 45. 412-415 (1990)
[Publications] Y.Nakai,K.Hattori and N.Itoh: "LaserーInduced Sputtering of Ga^o and Ga^+ from the GaP(110)Surface:Its Relation to Surface Imperfection" Appl.Phys.Lett.56. 1980 (1990)
[Publications] J.Singh and N.Itoh: "United Approach to Polymer Ablation and Desorption of Neutral Atoms from Surfaces of NonーMetallic Compounds" J.Lumin.45. 286 (1990)
[Publications] C.Itoh,K.Tanimura N.Itoh and M.Georgiev: "Intrinsic Luminescence and Defect Formation in Amorphous SiO_2" Reviews of Solid State Science. 4. 679 (1990)
[Publications] N.Itoh and K.Tanimura: "Formation of InterstiticalーVacancy Pairs by Electronic Excitation in Pure Ionic Crystals" J.Phys.Chem.51. 717-735 (1990)
[Publications] N.Itoh and K.Tanimura: "Effects of Photoーexcitation of SelfーTrapped Excitons in Insulators" Optical Engineering. 28. 1034-1038 (1989)
[Publications] C.Itoh,T.Suzuki and N.Itoh: "Luminescence and Defect Formation in Undensified and Densified Amorphous SiO_2 Phys.Rev.B" Phys.Rev.B. 41. 3794 (1990)
[Publications] N.Itoh: "Synergistic Effects in RadiationーInduced Particle Ejection from Solid Surfaces" Vacuum. 41. 1558 (1990)
[Publications] K.Tanimura and N.Itoh: "The Role of SelfーTrapped Excitons in RadiationーDamage Processes in Insulators" Nucl.Instrum.& Methods. 46. 207 (1990)
[Publications] M.Georgiev.and N.Itoh: "Reconstructed Adiabatic Energy Surfaces for SelfーTrapped Excitons in Binary Oxides" J.Phys.Condens.Matter. 2. 10021 (1990)

1990 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] C.Itoh,K.Tanimura,N.Itoh and M.Itoh: "Threshold Energy for Photogeneration of SelfーTrapped Excitons in SiO_2." Phys.Rev.B. 39. 11183-11186 (1989)

[Publications] T.Sugiyama,K.Tanimura and N.Itoh: "RecombinationーInduced MetastableーtoーStable Transformation of the EL2 Center in GaAs Induced by ElectronーHole Recombination in preparation." Appl.Phys.Let.55. 639-641 (1989)

[Publications] T.Shimizu,T.Fujita and N.Itoh: "Evidence for SolidーPhase Migration of Si Atoms in LaserーIrradiation Si^+ーImplanted SiO_2" J.Phys.C. 1. 5521 (1989)

[Publications] J.Singh,N.Itoh,and V.V.Truong: "Influence of ExcitonーExciton Interaction with Spin Paired Charge Carriers and ExcitonーLattice Interaction on the Surface Properties of Crystalline Solids" Applied Physics A. 49. 631-639 (1989)

[Publications] K.Hattori,Y.Nakai and N.Itoh: "Laser Sputtering as a Tool of Investigating Surface Optical Transitions" Surf.Sci.227. 115 (1990)

[Publications] K.Tanimura and N.Itoh: "Relaxation of Excitons Perturbed by SelfーTrapped in RbI:Evidence for Exciton Fusion in Inorganic Solids with Strong ElectronーLattice Coupling" Phys.Rev.Lett.64. 1429 (1990)

[Publications] Y.Nakai,K.Hattori and N.Itoh: "Studies of Laser Sputtering of GaP by Means of Resonance Ionization Spectroscopy:Response of Clean Solid Surfaces to PhotoーExcitation" Desorption Induced by Electronic Transitions(Springer Verlag,Berlin,1990). 5. 143 (1990)

[Publications] A.Shluger and N.Itoh: "Models of Electronic defects and SelfーTrapped Excitons in Li_2O" Phil.Mag.in print.

[Publications] N.Matsunami,K.Kitoh,J.Kanasaki and N.Itoh: "HighーResolution Analysis of Protons Scattered from Solid Surfaces" Nuclear Instruments and Methods in Physics Research. 45. 412-415 (1990)

[Publications] Y.Nakai,K.Hattori and N.Itoh: "LaserーInduced Sputtering of Ga^o and Ga^+ from the GaP(110)Surface:Its Relation to Surface Imperfection" Appl.Phys.Lett.56. 1980 (1990)

[Publications] J.Singh and N.Itoh: "United Approach to Polymer Ablation and Desorption of Neutral Atoms from Surfaces of NonーMetallic Compounds" J.Lumin.45. 286 (1990)

[Publications] C.Itoh,K.Tanimura N.Itoh and M.Georgiev: "Intrinsic Luminescence and Defect Formation in Amorphous SiO_2" Reviews of Solid State Science. 4. 679 (1990)

[Publications] N.Itoh and K.Tanimura: "Formation of InterstiticalーVacancy Pairs by Electronic Excitation in Pure Ionic Crystals" J.Phys.Chem.51. 717-735 (1990)

[Publications] N.Itoh and K.Tanimura: "Effects of Photoーexcitation of SelfーTrapped Excitons in Insulators" Optical Engineering. 28. 1034-1038 (1989)

[Publications] C.Itoh,T.Suzuki and N.Itoh: "Luminescence and Defect Formation in Undensified and Densified Amorphous SiO_2 Phys.Rev.B" Phys.Rev.B. 41. 3794 (1990)

[Publications] N.Itoh: "Synergistic Effects in RadiationーInduced Particle Ejection from Solid Surfaces" Vacuum. 41. 1558 (1990)

[Publications] K.Tanimura and N.Itoh: "The Role of SelfーTrapped Excitons in RadiationーDamage Processes in Insulators" Nucl.Instrum.& Methods. 46. 207 (1990)

[Publications] M.Georgiev.and N.Itoh: "Reconstructed Adiabatic Energy Surfaces for SelfーTrapped Excitons in Binary Oxides" J.Phys.Condens.Matter. 2. 10021 (1990)

伊藤憲昭名古屋大学, 理学部, 教授 (90022996)