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相关概念视频

Valence Bond Theory02:42

Valence Bond Theory

11.2K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.2K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.9K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
1.9K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.2K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
1.2K
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

2.3K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
2.3K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.4K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.4K
Colors and Magnetism03:02

Colors and Magnetism

13.9K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
13.9K

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相关实验视频

Updated: Jan 14, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

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自冷式分子自旋子

Elías Palacios1, David Aguilà2, David Gracia1

  • 1Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza and Departamento de Física de la Materia Condensada, Universidad de Zaragoza, Zaragoza, 50009, Spain.

Advanced materials (Deerfield Beach, Fla.)
|October 21, 2025
PubMed
概括
此摘要是机器生成的。

这项研究使用[GdEr]复合体在分子水平上整合了量子计算和磁冷却. 这种新型材料能够自冷却到0.4K,克服了分子自旋量子比特的低温限制.

关键词:
直接的磁热热量测量.兰化物离子 兰化物离子磁性制冷材料是使用磁性制冷材料.分子纳米磁铁的分子.旋转量子比特和量子比特.

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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

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相关实验视频

Last Updated: Jan 14, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

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科学领域:

  • 分子磁力学分子磁力学
  • 量子信息科学 量子信息科学
  • 材料科学 材料科学 材料科学

背景情况:

  • 运行分子自旋量子比特需要极低的温度,这构成了重大的技术挑战.
  • 目前的量子技术面临的局限性是由于需要冷制冷.
  • 将多个功能集成到单个分子系统中是材料科学的关键目标.

研究的目的:

  • 开发一种能够结合量子处理 (量子比特) 和磁性制冷能力的分子材料.
  • 为了克服在非常低的温度下运行分子自旋量子比特的技术限制.
  • 研究将加多 (Gd) 和 (Er) 离子集成到单个协调复合体中的协同效应.

主要方法:

  • 合成和表征异质兰化物协调复合物,特别是[GdEr],[LaEr]和[GdLu].
  • 使用磁性测量,热容量分析和电子磁共振 (EPR) 光谱.
  • 进行了脉冲EPR测量,用于连贯的操纵研究和直接磁热效应测量.

主要成果:

  • [GdEr] 复合体在Gd (III) 和Er (III) 离子之间表现出协同效应,增强了量子位功能和磁热性质.
  • 在Gd(III) 和Er(III) 旋转之间的合创建了一个独特的16个旋转状态,可通过连贯脉冲操纵.
  • 该材料表现出自我冷却能力,达到低至0.4K的温度,将冷却扩展到低于[GdLu]的范围.

结论:

  • [GdEr]异构化物复合物成功地将量子处理和磁性制冷在分子级别上集成在一起.
  • 这种综合方法为克服分子自旋量子比特的低温操作挑战提供了有希望的解决方案.
  • 该材料能够自冷至超低温度的能力为量子技术和纳米级冷却设备开辟了新的途径.