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相关概念视频

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...

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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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一个基于单个被困的199Hg+离子的光学时钟.

S A Diddams1, T Udem, J C Bergquist

  • 1Time and Frequency Division, National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA. sdiddams@boulder.nist.gov

Science (New York, N.Y.)
|July 14, 2001
PubMed
概括

研究人员开发了一种全光学原子钟,使用单个被困的离子 (199Hg+) 进行卓越的计时. 这种光学原子钟比目前的微波原子钟稳定性要好得多.

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10:42

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Published on: May 3, 2019

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科学领域:

  • 原子,分子和光学物理学
  • 计量学和测量科学 计量学和测量科学

背景情况:

  • 50年来,微波原子钟一直是时间和频率的主要标准.
  • 光学原子钟由于其更高的操作频率,因此具有更高稳定性的潜力.

研究的目的:

  • 为了展示一个全光学原子钟.
  • 为了实现超越微波标准的增强频率稳定性.

主要方法:

  • 使用单个被困的199Hg+离子,引用1.064-petahertz的过渡.
  • 采用模式锁定的五秒激光时钟,相连贯地锁定到光学频率.
  • 与激光冷却光学标准的性能比较.

主要成果:

  • 在1秒的平均化时间内达到7x10(-15) 的分数频率不稳定性上限.
  • 证明稳定性大大超过了最好的微波原子钟.

结论:

  • 基于光学转换的全光学原子钟提供了卓越的稳定性.
  • 展示的199Hg+离子时钟代表了精确计时技术的重大进步.