高感度ラマン分光法による固体表面吸着種の研究

使用高灵敏度拉曼光谱研究固体表面上的吸附物质

• 批准号: 62609503
• 负责人: 難波 孝夫
• 金额: $ 1.92万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62609503/
• 关键词: ラマン散乱; 化学吸着; 共存吸着; 電気陰性度; 仕事関数変化

本研究の目的はその化学吸着力が他の吸着系に比べて極めて弱いため電子分光法による研究が困難であった銀表面へのCO分子の吸着状態を高分解能ラマン分光法により明らかにすことにある.本研究によって得られた成果は次のようなものである. (1)吸着CO分子についてはその分子内振動モードによる一本のラマン帯の他に低エネルギー領域(100〜200cm^<-1>)に二本のラマン帯が存在する. それらの振動数の表面被履率依存性の観測からこれらが各々CO分子と下地金属原子間のAg-C振動モード及びCO分子の束縛回転モードに対応することが明らかとされた. (2)微量に初期吸着させたCO分子の近傍に異種分子(原子)を共存吸着させつつCO分子のラマン信号変化を観測するいわゆる共存吸着実験を行うことにより, 共存吸着分子(原子)の電気陰性度の強弱に応じてCO分子の分子間力及び下地原子への結合力が増減することを初めて見い出した. これらの現象はCO分子と下地原子間に形成された化学結合状態が共存吸着分子(原子)の電気陰性度の強弱の度合を反映した変化を受けるというモデルで理解できることを示した. (3)低速電子銃を用いた減速電位法によりラマン実験に使用された銀薄膜のCO分子の吸着によって誘発される仕事関数変化を測定し, 共存吸着分子(原子)の電気陰性度の強弱に応じて金属の仕事関数が増減することを明らかとした. つまり, 吸着CO分子の振動数変化と吸着に伴う下地金属の仕事関数変化という二つの物理量が(2)で述べたCO/Ag系におけるCO分子の吸着状態に関するモデルで統一的に理解されることが示された.

The purpose of this study is to determine the chemical adsorption capacity of the chemisorption system, which is weaker than that of the chemical adsorption system. The absorption of CO molecules on the surface is more sensitive than that of other chemisorptions. the purpose of this study is to study the adsorption of CO molecules on the surface by chemical adsorption. In this study, we have obtained the results of this study. (1) the absorption of CO molecules is related to the intramolecular vibration of ordinary universities in the field (100 ~ 200cm ^ & lt;-1>) of ordinary universities. The number of vibrations on the surface is dependent on the performance rate. The ground metal atoms under each CO molecule are subjected to Ag-C vibrations and CO molecular bundles. (2) in the early stage, CO molecules are adsorbed in the vicinity of many kinds of molecules (atoms). In the early stage, there are two kinds of molecules (atoms) in the vicinity of CO molecules (atoms). In the early stage, there are two kinds of molecules (atoms). In the early stage, there is a mixture of molecular (atomic) electronegativity, strong and weak molecular forces, molecular forces and ground atoms. The temperature is similar to that of the ground atoms under the CO molecule to form a chemical binding state. The coexistence of molecules (atoms) absorbs the electronicity of molecules (atoms). The strong and weak electrical properties of the molecules reflect the chemical properties of the molecules. (3) low-speed electrons are used for low-speed electronic devices. Low-speed electrons are used for low-speed electronics. low-speed electrons are used for low-speed electronics. low-speed electrons are used for low-speed electronics. low-speed electrons are used for low-speed electronics. low-speed electrons are used for low-speed electronics. low-speed electrons are used for low-speed electronics. low-speed electrons are used for low-speed electronics. low-speed electrons are used for low-speed electronics. low-speed electrons are used for low-speed electronics. low-speed electrons are used for low-speed electronics. low-speed electrons are used for low-speed electronics. low-speed electrons are used for low-speed electronics. low-speed electrons are used for low-speed electronics. low-speed electrons are used for low-speed electronics. low-speed electrons are used The absorption of CO molecules, the absorption of CO molecules, the absorption of metals under the ground, the physical quantities (2) of the CO/ Ag system, the absorption of CO molecules, the absorption of molecules, the number of molecules, the number of molecules

项目成果

Itsuro YAMAMOTO: Journal of physical Society of Japan.

山本五郎：日本物理学会杂志。