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関連する概念動画

Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
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.
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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関連する実験動画

Updated: Jun 29, 2026

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices
11:13

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices

Published on: April 6, 2016

自由電子レーザー. ステータスと申請について

P G O'Shea1, H P Freund

  • 1Department of Electrical and Computer Engineering and Institute for Plasma Research, University of Maryland, College Park, MD 20742, USA.

Science (New York, N.Y.)
|June 9, 2001
PubMed
まとめ

自由電子レーザーは,様々な研究のために磁場内の電子ビームを使用します. 将来の開発は,高度なアプリケーションのためのより高い電力とより短い波長を目指しています.

科学分野:

  • 物理 物理学 物理学とは
  • マテリアルサイエンス 材料科学
  • バイオフィジックス 生物物理学

背景:

  • 自由電子レーザー (FEL) は,周期磁場と相互作用する電子ビームを使用します.
  • 現在のFELは,材料科学,化学技術,生体物理科学,医療応用,表面研究,固体物理学など,様々な科学分野における不可欠なツールです.

研究 の 目的:

  • 自由電子レーザーの基本原理と現在の応用を強調する.
  • FEL技術の進行中の進歩について議論し,平均電力を増やし,より短い波長を達成することに焦点を当てます.
  • 次世代のFELの将来的な応用を探求する.

主な方法:

  • コアメカニズムは,相対性電子ビームを周期性磁気構造であるアンデュレーターを通過させることを含む.
  • 磁場との相互作用により,電子が振動し,シンクロトロン放射線を生成します.
  • この放射線は,電子束との共振相互作用によって増幅され,レーザー出力を形成します.

主要な成果:

  • 自由電子レーザーは,現在,幅広い研究分野をサポートしています.
  • 開発の取り組みは,FELのパフォーマンスメトリックの強化に焦点を当てています.
  • 将来のFELは,科学および産業用途に前例のない能力を提供すると予想されています.

さらに関連する動画

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale
08:17

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale

Published on: May 25, 2016

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: Jun 29, 2026

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices
11:13

Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices

Published on: April 6, 2016

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale
08:17

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale

Published on: May 25, 2016

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

結論:

  • 自由電子レーザーは,確立された研究用途を持つ多用途の光源です.
  • パワーと波長における進歩は,それらの可能性を拡大しています.
  • 将来の応用には,産業用材料加工と次世代X線源が含まれます.