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Related Concept Videos

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.
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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...
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The de Broglie Wavelength02:32

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Related Experiment Video

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

Delay in photoemission.

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
Summary
This summary is machine-generated.

Scientists measured a 21-attosecond delay in electron emission from neon atoms using attosecond metrology. This finding challenges instant photoemission assumptions and refines atomic-scale timekeeping for electron dynamics.

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

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

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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

Area of Science:

  • Atomic Physics
  • Quantum Mechanics
  • Ultrafast Science

Background:

  • Photoemission is traditionally assumed to be instantaneous.
  • This assumption underpins the definition of zero time for tracking electron motion at the atomic scale.

Purpose of the Study:

  • To investigate the timing of photoemission from different atomic orbitals.
  • To explore the potential of attosecond metrology for precise atomic-scale time measurements.

Main Methods:

  • Utilized attosecond metrology to probe electron emission from neon atoms.
  • Employed a 100-electron volt light pulse to ionize neon.

Main Results:

  • Observed a significant delay of 21 ± 5 attoseconds in the photoemission of electrons from neon's 2p orbitals compared to its 2s orbitals.
  • Demonstrated that photoemission timing varies between different quantum states.

Conclusions:

  • The study reveals a measurable delay in photoemission, challenging the instantaneous emission model.
  • Attosecond timing metrology offers a precise method for probing many-electron dynamics and refining atomic chronoscopy.