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相关概念视频

Coordination Number and Geometry02:57

Coordination Number and Geometry

19.0K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
19.0K
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

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VSEPR Theory for Determination of Electron Pair Geometries
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Molecular Geometry and Dipole Moments02:36

Molecular Geometry and Dipole Moments

18.8K
The VSEPR theory can be used to determine the electron pair geometries and molecular structures as follows:
18.8K
Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

5.1K
This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
5.1K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.7K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.7K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.5K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.5K

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相关实验视频

Updated: Jan 28, 2026

A Paired Bead and Magnet Array for Molding Microwells with Variable Concave Geometries
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取决于几何的光子纳米喷气形成和阵列合.

Zehua Sun1, Shaobo Ge1, Lujun Shen1

  • 1Shaanxi Province Key Laboratory of Thin Films Technology and Optical Test, School of Optoelectronic Engineering, Institute for Interdisciplinary and Innovation Research, Xi'an Technological University, Xi'an 710021, China.

Nanomaterials (Basel, Switzerland)
|January 27, 2026
PubMed
概括

这项研究探讨了光子纳米喷射 (PNJ) 阵列中的不同形状如何影响光的聚焦. 形和金字塔形状比圆柱体和截断金字塔提供了更强,更稳定的聚焦.

关键词:
阵列合器 阵列合器几何配置的几何配置.光子子 摄影机子一个光子纳米喷射器.

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科学领域:

  • 光子学 是一个光子学.
  • 光学工程是指光学工程.
  • 材料科学 材料科学 材料科学

背景情况:

  • 光子纳米网 (PNJ) 是由波长以下介电结构产生的高度局部化的光学场.
  • 了解数组中的PNJ行为对于光学传感和微操作等应用至关重要.
  • 几何配置对PNJ平面数组的影响需要进行系统的调查.

研究的目的:

  • 系统地研究由介电微结构形成的光子纳米喷射 (PNJ) 平面阵列.
  • 分析几何,阵列排列和稀疏性对PNJ形成和合的影响.
  • 为了确定增强PNJ属性的最佳几何配置.

主要方法:

  • 使用全波有限差异时间域 (FDTD) 模拟.
  • 分析了各种阵列配置 (圆柱体,圆,截断金字塔,金字塔) 的光学场分布.
  • 研究了元素间距和数组稀疏度对合行为的影响.

主要成果:

  • 不同的几何体表现出不同的合反应和PNJ强度.
  • 金字塔和圆结构显示出更高的空间稳定性和显著更高的PNJ强度 (高达93AU). 与圆柱体和截断的金字塔相比.
  • 半最大全宽度 (FWHM) 在几何学上保持一致,表明几何学决定横向聚焦.
  • 阵列稀疏度可以调整以控制元素间合,不同的几何形状需要特定的稀疏度水平.

结论:

  • 几何配置是PNJ平面阵列性能的主要因素.
  • 圆和金字塔结构对于实现高强度,稳定的PNJ是优越的.
  • 这些发现为各种应用的PNJ平面阵列的可预测设计提供了必要的指导.