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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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覆盖效应和S/Au中的金属硫键的性质:高分辨率光辐射和密度功能性研究.

José A Rodriguez1, Joseph Dvorak, Tomas Jirsak

  • 1Department of Chemistry, Brookhaven National Laboratory, Upton, NY 11953, USA.

Journal of the American Chemical Society
|January 8, 2003
PubMed
概括

硫与黄金表面的结合表现出复杂的行为. 在低覆盖率下,硫在特定位置吸附,但高覆盖率导致S-S结合和黄金表面的独特移动性.

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科学领域:

  • 表面科学是一门学科.
  • 材料化学 材料化学
  • 固态物理 固态物理

背景情况:

  • 硫与黄金的结合在化学,物理学和材料科学中至关重要.
  • 了解硫与黄金的相互作用有助于表面工程和催化.

研究的目的:

  • 研究硫与Au(111) 和多晶金表面的相互作用.
  • 根据覆盖面和温度,确定吸附点,粘合特性和物种形成.

主要方法:

  • 使用基于同步子的高分辨率光辐射光谱学.
  • 采用第一原则密度函数 (DF) 板计算用于理论分析.

主要成果:

  • 硫吸附取决于地点,在低覆盖面上偏好fcc空洞地点.
  • 增加的硫覆盖面削弱了Au-S键,促进了S-S结合,并形成了超过0.4毫升的S(2) 物种.
  • 与其他金属相比,在黄金表面观察到独特的硫原子流动性和反应性.

结论:

  • 硫黄接口表现出复杂的,取决于覆盖范围的行为.
  • 硫与黄金的相互作用与硫在过渡金属上的行为有很大不同.
  • 研究结果提供了对黄金表面硫吸附机制的见解.