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Related Concept Videos

Photoelectric Effect02:26

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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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Updated: Dec 22, 2025

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
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Controlling photoionization using attosecond time-slit interferences.

Yu-Chen Cheng1, Sara Mikaelsson1, Saikat Nandi1

  • 1Department of Physics, Lund University, 22100 Lund, Sweden.

Proceedings of the National Academy of Sciences of the United States of America
|May 2, 2020
PubMed
Summary
This summary is machine-generated.

Scientists manipulated electron emission from helium atoms using attosecond pulses. This research challenges fundamental rules of the photoelectric effect and enables control over ultrafast quantum processes.

Keywords:
attosecond pulseselectron momentum spectroscopyphotoelectric effectphotoionization

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Area of Science:

  • Quantum physics
  • Attosecond science
  • Photoionization

Background:

  • Photoionization of atoms typically follows energy quantization and parity conservation rules.
  • These rules are based on approximations that may fail under intense, ultrashort laser pulses.
  • The universality of these rules for the photoelectric effect needs further investigation.

Purpose of the Study:

  • To investigate photoionization of helium using a sequence of attosecond pulses.
  • To explore the breakdown of traditional photoemission rules under extreme conditions.
  • To demonstrate control over photoelectron energy and emission direction.

Main Methods:

  • Irradiation of helium with a sequence of attosecond pulses.
  • Inclusion of a weak infrared laser field to modulate the process.
  • Measurement of photoelectron energy and angular distribution.

Main Results:

  • Demonstrated continuous control over photoelectron energy.
  • Induced asymmetry in the electron emission direction, deviating from idealized rules.
  • Showcased the breakdown of standard approximations in photoionization.

Conclusions:

  • The study challenges the universality of basic photoemission rules.
  • Attosecond pulse sequences offer precise control over ultrafast light-matter interactions.
  • This opens new avenues for manipulating quantum processes with tailored light pulses.