Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

Nuclear Stability03:18

Nuclear Stability

Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together in the...
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

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, and the angular frequency...
Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers energy to a nearby...
Radioactive Decay and Radiometric Dating02:48

Radioactive Decay and Radiometric Dating

Radioactivity is a spontaneous disintegration of an unstable nuclide and is a random process, as all the nuclei in the sample do not decay simultaneously. The number of disintegrations per unit time is called the activity (A), which is directly proportional to the number of nuclei in the sample. The decay constant (λ) is an average probability of decay per nucleus in unit time.
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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...
Atomic Mass01:52

Atomic Mass

Atoms — and the protons, neutrons, and electrons that compose them — are extremely small. For example, a carbon atom weighs less than 2 × 10−23 g. When describing the properties of tiny objects such as atoms, we use appropriately small units of measure, such as the atomic mass unit (amu). The amu was originally defined based on hydrogen, the lightest element, then later in terms of oxygen. Since 1961, it has been defined with regard to the most abundant isotope of carbon, atoms of which are...

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Blackbody radiation Zeeman shift in Rydberg atoms.

Physical review. A·2026
Same author

Towards the optical second: verifying optical clocks at the SI limit.

Physical review. X·2024
Same author

Statistics for quantifying aging in time transfer system delays.

Metrologia·2024
Same author

Dissemination of UTC(NIST) over 20 km of commercial optical fiber with active phase stabilization.

Optics letters·2024
Same author

Excited-Band Coherent Delocalization for Improved Optical Lattice Clock Performance.

Physical review letters·2024
Same author

Trap-Induced ac Zeeman Shift of the Thorium-229 Nuclear Clock Frequency.

Physical review letters·2023
Same journal

A native sulfur deposit in Gale crater, Mars.

Science (New York, N.Y.)·2026
Same journal

Coordinated demise of harmful algal blooms.

Science (New York, N.Y.)·2026
Same journal

Genetic effects put into context.

Science (New York, N.Y.)·2026
Same journal

Bacteria share proteins to survive antibiotics.

Science (New York, N.Y.)·2026
Same journal

Impacts shaped Earth's first continents.

Science (New York, N.Y.)·2026
Same journal

Erratum for the Report "Covalently bonded single-molecule junctions with stable and reversible photoswitched conductivity" by C. Jia <i>et al</i>.

Science (New York, N.Y.)·2026
関連記事をすべて見る

関連する実験動画

Updated: May 8, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
10:42

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

Published on: May 3, 2019

10(-18) の不安定性を有する原子時計.

N Hinkley1, J A Sherman, N B Phillips

  • 1National Institute of Standards and Technology (NIST), Boulder, CO 80305, USA.

Science (New York, N.Y.)
|August 24, 2013
PubMed
まとめ
この要約は機械生成です。

超冷たいイテルビウム原子を使用した2つの新しい原子時計は,前例のないタイムキーピングの不安定性を達成します. この画期的な発見は,ジオデシー,ナビゲーション,そして基礎物理学の研究におけるアプリケーションの精密タイミングを進歩させています.

さらに関連する動画

In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence
07:03

In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence

Published on: June 13, 2020

Picometer-Precision Atomic Position Tracking through Electron Microscopy
15:04

Picometer-Precision Atomic Position Tracking through Electron Microscopy

Published on: July 3, 2021

関連する実験動画

Last Updated: May 8, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
10:42

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

Published on: May 3, 2019

In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence
07:03

In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence

Published on: June 13, 2020

Picometer-Precision Atomic Position Tracking through Electron Microscopy
15:04

Picometer-Precision Atomic Position Tracking through Electron Microscopy

Published on: July 3, 2021

科学分野:

  • 原子物理 原子物理学
  • メトロロジー・メトロロジー
  • 量子テクノロジーは,量子技術である.

背景:

  • 原子時計は,GPSや高度な通信などの現代技術にとって極めて重要です.
  • 現在の原子時計は,基本的な物理テストやナビゲーションの正確な測定を可能にします.
  • 計時におけるより高い精度を達成することは,新しい科学技術的領域を開拓します.

研究 の 目的:

  • 2つの高度な光学格子時計を開発し,運用する.
  • スピン極化,超冷たい原子イテルビウムを使用して,時計の性能を向上させる.
  • 原子時計の不安定性に関する新しい基準を証明するために.

主な方法:

  • 2つの光学格子時計の開発と運用.
  • スピン極化,超冷たい原子イテルビウムを使用しています.
  • 開発された2つの時計システムの性能を比較する.

主要な成果:

  • 1.6 × 10−18. の前例のない原子時計の不安定性を実証しました.
  • この高いレベルの不安定性は,平均を計算したわずか7時間後に達成されました.
  • 原子時計の性能の新たな基準を確立した.

結論:

  • 開発された光学格子時計は,正確な計時における重要な進歩を表しています.
  • このレベルの精度は,相対論的地質学,ナビゲーション,基礎物理学の新たな応用への扉を開く.
  • これらの時計によるさらなる研究は,科学的発見の限界を押し上げるでしょう.