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相关概念视频

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

1.1K
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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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 Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

3.1K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
3.1K
Diamagnetism01:26

Diamagnetism

2.9K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.9K
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
Paramagnetism01:30

Paramagnetism

3.0K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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空间对称性被破坏的原子磁力学.

Sanghyun Park, Min-Hwan Lee, Hyogi Kim

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    此摘要是机器生成的。

    我们开发了一个新的原子磁传感器,使用空间对称性破碎的四波混合. 这种敏感的磁力计为生物磁传感和磁场测绘等应用提供了强大的性能.

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    科学领域:

    • 原子物理 原子物理
    • 量子光学就是一个量子光学.
    • 磁力学测量是一种磁力学测量.

    背景情况:

    • 原子磁传感器对于各种科学和技术应用至关重要.
    • 现有的传感器在灵敏度,带宽或操作条件方面面临限制.

    研究的目的:

    • 报告一项新型的原子磁传感器利用空间对称性破坏 (SSB) 在四波混合 (FWM) 过程中.
    • 为了描述这个SSB磁力计用于弱磁场检测的性能.

    主要方法:

    • 使用了鲁比蒸汽电池和反传播偏振选择性FWM信号.
    • 利用外部磁场诱导的空间对称性破裂特性.
    • 在零磁场周围测量散射信号.

    主要成果:

    • 在-5μT到5μT的范围内实现了线性反应.
    • 在10 Hz时显示出大约10 pT/√Hz的磁性灵敏度.
    • 获得了 18.25 kHz 的传感器带宽.

    结论:

    • 开发的SSB磁力计是一种强大的原子磁传感器.
    • 这项技术具有多种应用的潜力,包括生物磁传感和地球磁场测绘.