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関連する概念動画

Emission Spectra02:39

Emission Spectra

59.4K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
59.4K
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

2.4K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
2.4K
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

221
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
221
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

560
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.
560
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

245
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
245
Nuclear Fusion02:45

Nuclear Fusion

26.7K
The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
26.7K

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関連する実験動画

Updated: Aug 18, 2025

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

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コンパクトバイナリ合併によるギガ電子ボルトの排出量

Alessio Mei1,2, Biswajit Banerjee3,4, Gor Oganesyan3,4

  • 1Gran Sasso Science Institute, L'Aquila, Italy. alessio.mei@gssi.it.

Nature
|December 8, 2022
PubMed
まとめ

長期ガンマ線爆発 (GRB) は,コンパクトバイナリ融合と関連していました. 予期せぬ高エネルギーガンマ線放射が観測され,おそらくキロノヴァ光子による逆コンプトン散乱によるものであった.

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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

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関連する実験動画

Last Updated: Aug 18, 2025

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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科学分野:

  • 天体物理学
  • 高エネルギー天体物理学
  • 重力波天文学

背景:

  • ガンマ線爆発 (GRB) は通常 巨大な星の崩壊と関連しています
  • GRB 211211Aは長い期間にもかかわらず,光学赤外線キロノヴァの放射を示し,コンパクトな二重結合の起源を示唆しました.
  • 標準的な照明モデルでは,GRBからの遅い時間の放射を完全に説明できません.

研究 の 目的:

  • GRB 211211Aからの高エネルギーガンマ線放射の起源を調査する.
  • 観測された放射は標準的な後照明モデルで説明できるのか,それとも別の説明が必要なのかを判断する.
  • コンパクトバイナリ合併を理解するためのこれらの発見の含意を探求する.

主な方法:

  • GRB 211211Aの多波長観測,公開データと専用データを含む.
  • ガンマ線放射の詳細なモデリング,観測と理論的な後光予測を比較する.
  • 逆コンプトン散乱のような潜在的な放出メカニズムの分析.

主要な成果:

  • GRB 211211Aから高エネルギーガンマ線放射 (0.1 GeV以上) が検出され,爆発から1000秒後に始まった.
  • 遅い時期に観測されたガンマ線流は,標準的な後光モデルからの予測を超えました.
  • キロノバ放射は,逆コンプトン散乱のための潜在的な種子光子の源として特定されました.

結論:

  • GRB 211211Aからの高エネルギー放出は,標準的な後発光プロセスによるものではありません.
  • キロノヴァ光子との 遅い時間のジェットの相互作用による 逆コンプトン放射は 合理的な説明を提供している.
  • この発見は 二重中性子星の合併に関連する現象について 新たな洞察をもたらします