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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...
Photoelectric Effect02:26

Photoelectric Effect

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...
Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

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...
The de Broglie Wavelength02:32

The de Broglie Wavelength

In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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...
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation

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関連する実験動画

Updated: Jun 12, 2026

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
06:08

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera

Published on: December 27, 2018

フォトエミッションの遅延

M Schultze1, M Fiess, N Karpowicz

  • 1Department für Physik, Ludwig-Maximilians-Universität, Am Coulombwall 1, D-85748 Garching, Germany. Martin.Schultze@mpq.mpg.de

Science (New York, N.Y.)
|June 26, 2010
PubMed
まとめ
この要約は機械生成です。

科学者たちは,アト秒メトロロジーを用いてネオン原子からの電子放出の21アト秒の遅延を測定しました. この発見は,瞬時の光放出の仮定に異議を唱え,電子ダイナミクスの原子スケールの時間計測を精製している.

さらに関連する動画

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
08:53

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

関連する実験動画

Last Updated: Jun 12, 2026

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
06:08

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera

Published on: December 27, 2018

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
08:53

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

科学分野:

  • 原子物理 原子物理学
  • 量子力学は,量子力学という
  • 超高速科学とは

背景:

  • フォトエミッションは,伝統的に瞬時に発生すると考えられています.
  • この仮定は,原子スケールでの電子の動きを追跡するためのゼロタイムの定義を裏付けている.

研究 の 目的:

  • 異なる原子軌道からの光放出のタイミングを調査する.
  • 精密な原子スケールの時間測定のためのアット秒メトロロジーの可能性を探求する.

主な方法:

  • アット秒メトロロジーを活用して,ネオン原子からの電子放出を検出しました.
  • 100電子ボルトの光パルスを使ってネオンをイオン化しました.

主要な成果:

  • ネオンの2p軌道から2s軌道に比べて,電子の光放出で21 ± 5アト秒の有意な遅延が観察されました.
  • 光放射のタイミングが異なる量子状態によって変化することを示した.

結論:

  • この研究は,光放出の測定可能な遅延を明らかにし,瞬時の放出モデルに異議を唱える.
  • アット秒計測は,多くの電子のダイナミクスを探査し,原子クロノスコピーを精錬するための正確な方法を提供します.