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相关概念视频

The de Broglie Wavelength02:32

The de Broglie Wavelength

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Electrophilic Addition of HX to 1,3-Butadiene: Thermodynamic vs Kinetic Control01:23

Electrophilic Addition of HX to 1,3-Butadiene: Thermodynamic vs Kinetic Control

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The addition of a hydrogen halide to 1,3-butadiene gives a mixture of 1,2- and 1,4-adducts. Since more substituted alkenes are more stable, the 1,4-adduct is expected to be the major product. However, the product distribution is strongly influenced by temperature; low temperature favors the 1,2-adduct, whereas the 1,4-adduct is predominant at high temperature.
3.0K

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相关实验视频

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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

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在Xanthone中超快的系统间交叉

Marc Alías-Rodríguez1,2, Coen de Graaf1,3, Miquel Huix-Rotllant2

  • 1Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel·lí Domingo 1, Tarragona 43 007, Spain.

Journal of the American Chemical Society
|December 14, 2021
PubMed
概括

随着El-Sayed的规则,Xanthone表现出快速的单体-三体系统交叉. 它的光化学涉及连续的内部转换和电子状态之间的系统间交叉,通过可访问的状态交叉来促进.

科学领域:

  • 摄影化学
  • 量子化学
  • 光谱学

背景情况:

  • 芳香具有快速的系统间交叉 (ISC).
  • 桑具有已知最快的单位三位数之一 (约1.5 ps).
  • 尚不清楚尚的快速ISC的确切机制.

研究的目的:

  • 调查克桑超快光化学的机制.
  • 在xanthon中阐明顺序电子转换.
  • 确定El-Sayed规则在xanthone的ISC中的作用.

主要方法:

  • 波束动力学模拟
  • 气相和极性溶剂的计算
  • 电子状态转换和能源障碍的分析.

主要成果:

  • 对于ISC,Xanthone遵循了El-Sayed的规则.
  • 一个顺序的机制被确定为: 1ππ* → 1nπ* (85 fs), 1nπ* → 3ππ* (2.0 ps), 3ππ* → 3nπ* (602 fs).
  • 在最低能源结构附近无障碍访问电子状态交叉点可以推动高效的过渡.

结论:

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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
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  • 这项研究阐明了的超快光化学机制.
  • 埃尔-赛耶德的规则控制了快速的单元三元交叉系统.
  • 有效的电子状态转换可以通过可访问的交叉点和有利的能量.