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

Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

4.0K
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...
4.0K
Photoelectric Effect02:26

Photoelectric Effect

39.9K
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
39.9K
Photosystem II01:22

Photosystem II

79.0K
The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
79.0K
Nuclear Transmutation03:20

Nuclear Transmutation

20.8K
Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
20.8K
The Photochemical Reaction Center01:29

The Photochemical Reaction Center

5.6K
Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
5.6K
Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

1.9K
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
1.9K

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

Pilot full-scale demonstration of a prototype table-top neutron resonance transmission analysis system for nuclear material detection.

Communications engineering·2026
Same author

3D reconstruction of typhoon Trami 2018 eye and eyewall clouds from airborne imaging.

Scientific reports·2025
Same author

Downward terrestrial gamma-ray flash associated with collision of lightning leaders.

Science advances·2025
Same author

Rapid spin changes around a magnetar fast radio burst.

Nature·2024
Same author

X-ray polarization evidence for a 200-year-old flare of Sgr A<sup></sup>.

Nature·2023
Same author

Catalog of 525 sprites observed over Japan from September 2016 to March 2021.

Heliyon·2023

関連する実験動画

Updated: Feb 18, 2026

Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs
07:51

Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs

Published on: August 27, 2019

7.3K

雷の放電によって引き起こされる光核反応

Teruaki Enoto1, Yuuki Wada2,3, Yoshihiro Furuta2

  • 1The Hakubi Center for Advanced Research and Department of Astronomy, Kyoto University, Kyoto 606-8302, Japan.

Nature
|November 24, 2017
PubMed
まとめ

科学者たちは 雷の後にニュートロンとポジトンを観測し 大気中の光核反応を 確認しました この研究は,雷の発生後のポジトロン生成の 決定的な証拠を提供します.

さらに関連する動画

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

9.2K
Separation of Spinach Thylakoid Protein Complexes by Native Green Gel Electrophoresis and Band Characterization using Time-Correlated Single Photon Counting
08:40

Separation of Spinach Thylakoid Protein Complexes by Native Green Gel Electrophoresis and Band Characterization using Time-Correlated Single Photon Counting

Published on: February 14, 2019

8.8K

関連する実験動画

Last Updated: Feb 18, 2026

Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs
07:51

Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs

Published on: August 27, 2019

7.3K
Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

9.2K
Separation of Spinach Thylakoid Protein Complexes by Native Green Gel Electrophoresis and Band Characterization using Time-Correlated Single Photon Counting
08:40

Separation of Spinach Thylakoid Protein Complexes by Native Green Gel Electrophoresis and Band Characterization using Time-Correlated Single Photon Counting

Published on: February 14, 2019

8.8K

科学分野:

  • 大気物理学
  • 核天体物理学
  • 高エネルギー物理学

背景:

  • 天然の粒子加速器として 高エネルギーガンマ線を生成します
  • これらのガンマ線は 光子核反応を誘発し 中性子や陽子を生成する可能性があります
  • これまでの観測では 雷が鳴った後に これらの反応が起こると示唆されていたが 確固たる証拠は得られなかった.

研究 の 目的:

  • 雷の衝撃で ニュートロンとポジトロンが生成される 確固たる証拠を提供するためです
  • 雷が発するガンマ線によって引き起こされる 大気中の光核反応を調査する

主な方法:

  • 雷雨中のガンマ線閃光を 地上から監視する.
  • その後のガンマ線光と線放射スペクトルの分析.
  • ニュートロンとポジトロン信号の検出 雷の発生と相関する

主要な成果:

  • ミリ秒間のガンマ線閃光が検出され その後は衰えていく光でした
  • 0.511メガエレクトロンボルトの延長された線放射は,電子-ポジートロン破壊を示すことが観察されました.
  • 観測された信号は,光子核反応による中性子捕獲とポジトロン生成の予測と一致する.

結論:

  • 閃電後のポジトロン生成の 決定的な証拠が確立されました
  • この発見は,雷が大気中の光核反応を起こすことを確認しています.
  • この研究により 極端な大気中の電気現象の理解が深まりました