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関連する概念動画

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 Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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.
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

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Updated: Jul 2, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

天文観測のためのレーザー周波数.

Tilo Steinmetz1, Tobias Wilken, Constanza Araujo-Hauck

  • 1Max-Planck Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany.

Science (New York, N.Y.)
|September 6, 2008
PubMed
まとめ
この要約は機械生成です。

天文スペクトログラフは,レーザー周波数校正を使用して,これまでにないドップラー精度を達成することができます. この画期的な発見により,宇宙の膨張の歴史と加速を直接測定することが可能になった.

さらに関連する動画

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

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
08:48

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

Published on: November 22, 2019

関連する実験動画

Last Updated: Jul 2, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

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

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
08:48

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

Published on: November 22, 2019

科学分野:

  • 天文学 (astronomy) 天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは
  • 天体物理学 天体物理学
  • 光学工学は,光学工学である.

背景:

  • 宇宙の膨張の歴史を直接測定するには,赤道移転の進化を観察する必要があります.
  • 現在の天文スペクトログラフは,ドップラー速度漂移測定に必要な精度 (約. 1cm/s/yr) である.

研究 の 目的:

  • 天文望遠鏡の波長校正のためのレーザー周波数の最初の使用を実証する.
  • この新しい校正技術で達成可能なドップラー精度を評価するために.

主な方法:

  • 天文望遠鏡の高精度波長校正のためにレーザー周波数を使用しました.
  • 分析されたスペクトログラフと検出器システムのデータを用いて,体系的な効果を特定し,追跡する.

主要な成果:

  • 1.5マイクロメートルで約9m/sの等価ドップラー精度で絶対的な校正を達成しました.
  • 複雑で時間的に変動する体系的な効果を追跡する際にレーザー周波数校正の利点を実証した.

結論:

  • レーザー周波数の校正は,現在の最先端の方法の精度を大幅に上回ります.
  • このテクニックは,宇宙加速を検出することを目的とした将来の宇宙学的実験のための体系的なエラーのモデリングと除去のための実行可能な経路を提供します.