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相关概念视频

Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
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Bewley Lattice Diagram01:12

Bewley Lattice Diagram

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The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
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Lattice Centering and Coordination Number02:33

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Oscillations In An LC Circuit01:30

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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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相关实验视频

Updated: Jun 28, 2025

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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兴奋频段连贯移位,以提高光学格子时钟性能.

J L Siegel1,2, W F McGrew1,2, Y S Hassan1,2

  • 1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.

Physical review letters
|April 13, 2024
PubMed
概括
此摘要是机器生成的。

在激发的格子带中连贯移位,通过降低原子密度来改善原子钟的性能. 这种方法通过抑制-171原子钟中的碰撞和原子损失来增强系统的不确定性和不稳定性.

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科学领域:

  • 原子物理 原子物理
  • 量子光学是一种量子光学.
  • 计量学 计量学 计量学

背景情况:

  • 原子钟对于精确的计时至关重要.
  • 改善系统的不确定性和不稳定性是原子钟性能的主要挑战.
  • 冷碰撞转移和两体损失降低了时钟的准确性.

研究的目的:

  • 在激发的格子带中实现连贯的移位,以提高原子钟的性能.
  • 为了抑制冷碰撞转移和Yb原子中的两体损失.
  • 研究移位对原子空间分布和时钟指标的影响.

主要方法:

  • 在为 ^{171}Yb 原子激发的格子带中实现了连贯的移位.
  • 使用垂直定向的光学网格.
  • 测量了陷灯诱导的火率和激发状态的自然寿命.

主要成果:

  • 原子的空间分布增加了大约7倍.
  • 降低了冷碰撞转移的6.5 ((8) 倍.
  • 使不弹性两体损失可以忽略不计.
  • 测量陷灯诱导的火率为5.7(7) ×10^{-4} E_{r}^{-1} s^{-1} 和自然寿命为19(2) s.

结论:

  • 激发格子带中的连贯移位是改善原子钟性能的有效工具.
  • 这种技术显著减少了系统的不确定性和不稳定性.
  • 这些发现为更精确的原子钟铺平了道路.