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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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...
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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. Schrödinger...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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. This...
Atomic Structure01:33

Atomic Structure

All matter is composed of atoms, the smallest individual units of elements. Each atom is made up of three subatomic particles: protons, neutrons, and electrons. Together, these three particles account for the mass and the charge of an atom.The History of Atomic TheoryThe first person to propose that everything on Earth is made up of tiny particles was the Greek philosopher Democritus, around 450 B.C. He used the term atomos, Greek for “indivisible,” from which the modern term “atom” is derived.
Atomic Structure01:17

Atomic Structure

The Greek philosopher Democritus proposed that everything on Earth is made up of tiny particles called atomos, Greek for "indivisible," from which the modern term "atom" is derived. In the 19th century, John Dalton proposed the atomic theory that is still largely correct today. He put forth five postulates to explain how atoms made up the world around us. (1) All matter is composed of infinitely small particles or atoms. (2) All atoms of a given element are identical to one another and (3) are...
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

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.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...

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Updated: Jun 22, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

原子運動の包括的な制御

Mark G Raizen1

  • 1Center for Nonlinear Dynamics and Department of Physics, University of Texas at Austin, Austin, TX 78712, USA. raizen@physics.utexas.edu

Science (New York, N.Y.)
|June 13, 2009
PubMed
まとめ
この要約は機械生成です。

この研究は,磁場と単光子冷却を使用して原子を捕まえて冷却するための2段階の方法を提示しています. この研究は,この冷却技術と情報エントロピーの関連性を探求し,水素同位体試験における潜在的な応用を図る.

さらに関連する動画

Hand Controlled Manipulation of Single Molecules via a Scanning Probe Microscope with a 3D Virtual Reality Interface
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Hand Controlled Manipulation of Single Molecules via a Scanning Probe Microscope with a 3D Virtual Reality Interface

Published on: October 2, 2016

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

関連する実験動画

Last Updated: Jun 22, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Hand Controlled Manipulation of Single Molecules via a Scanning Probe Microscope with a 3D Virtual Reality Interface
11:00

Hand Controlled Manipulation of Single Molecules via a Scanning Probe Microscope with a 3D Virtual Reality Interface

Published on: October 2, 2016

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

科学分野:

  • 原子物理学 原子物理学とは
  • 量子情報科学とは,量子情報科学である.

背景:

  • 原子を閉じ込め,冷却するための2段階の一般的な解決策が開発されています.
  • 最初のステップは,パルスフィールドを使用してパラマグネティックな原子の磁性停止です.
  • 2番目のステップは,片方向のバリアメカニズムに依存する単光子冷却を使用します.

研究 の 目的:

  • シングルフォトン冷却と情報エントロピーの関係について議論する.
  • 単光子冷却の歴史的文脈を探求し,マクスウェルの悪魔とレオ・シラードの研究と関連付けます.
  • 水素同位素を含む基本的な試験のためのこれらの原子冷却方法の将来のアプリケーションを概説する.

主な方法:

  • パルスフィールドによるパラ磁性原子の磁性停止.
  • 片道バリアを使用した単光子冷却.
  • 冷却機構を情報エントロピーと統計力学と結びつける理論的議論.

主要な成果:

  • 原子を閉じ込め,冷却するための新しい2段階のアプローチが紹介されています.
  • シングルフォトン冷却と情報エントロピーの関係が解明される.
  • 基礎物理テストの潜在的な応用が特定されています.

結論:

  • 提示された2段階の方法は,原子操作の実行可能な戦略を提供します.
  • シングルフォトン冷却は,情報理論の原理と深いつながりを示しています.
  • 将来の研究は,これらの技術を水素同位体研究と基礎物理学に適用することに焦点を当てます.