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Atomic Nuclei: Larmor Precession Frequency01:11

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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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Following the work of Ernest Rutherford and his colleagues in the early twentieth century, the picture of atoms consisting of tiny dense nuclei surrounded by lighter and even tinier electrons continually moving about the nucleus was well established. This picture was called the planetary model since it pictured the atom as a miniature “solar system” with the electrons orbiting the nucleus like planets orbiting the sun. The simplest atom is hydrogen, consisting of a single proton as...
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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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The Quantum-Mechanical Model of an Atom02:45

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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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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Atomic Nuclei: Nuclear Spin01:08

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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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高電荷のイオンに基づく光学原子時計

Steven A King1,2, Lukas J Spieß3, Peter Micke1,4,5

  • 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany.

Nature
|November 3, 2022
PubMed
まとめ
この要約は機械生成です。

研究者らは,高電荷イオン (HCI),特にアルゴン-13プラス (Ar13+) を使用した新しい光学原子時計を開発しました. この突破は 基礎物理学のテストや 標準モデルを超えた 新しい物理学の探求に 前例のない精度をもたらします

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科学分野:

  • 原子物理学
  • メトロロジー
  • 量子電動学

背景:

  • 光学的な原子時計は,幅広い用途を持つ主要な測定装置です.
  • 高電荷イオン (HCI) は独特の原子特性を提供し,時計の性能を向上させ,環境への感受性を低下させます.

研究 の 目的:

  • 高電荷のイオンを用いた 新しいタイプの光学時計を 実現するためです
  • 高精度時計や基本的な物理テストの基準として,HCIで禁止された光学トランジションを確立する.

主な方法:

  • Ar13+における磁気二極移行に基づく光学原子時計の開発.
  • 系統的な周波数不確実性の包括的な評価
  • 移行周波数と同位体シフトの不確実性を改善するためのクロック比較.

主要な成果:

  • 既存の光学時計に匹敵する,Ar13+クロックで 2.2 × 10^-17の系統的な周波数不確実性を達成した.
  • 絶対的な移行周波数と同位体シフトの不確実性は,それぞれ8倍と9倍に改善された.
  • 量子電動力学 (QED) の核反転効果を調査し,理論的不確実性を3倍に減らした.

結論:

  • HCIの禁止光学トランジションは,最先端の光学時計の実行可能な参照として確立されています.
  • この研究は 標準モデルを超えた物理学の 高感度な探求への道を開きます
  • Ar13+時計は 精度測定と 基礎物理学の探索における 重要な進歩を象徴しています