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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

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,...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...

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Related Experiment Video

Updated: May 13, 2026

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
09:49

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers

Published on: October 23, 2018

Interference-induced peak splitting in extreme ultraviolet superfluorescence.

Ni Cui1, Christoph H Keitel, Mihai Macovei

  • 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, Heidelberg D-69117, Germany.

Optics Letters
|March 5, 2013
PubMed
Summary

We observed laser-induced quantum interference in helium, splitting extreme ultraviolet superfluorescence into two controlled pulses. This finding has potential applications in advanced pump-probe experiments.

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Area of Science:

  • Atomic physics
  • Quantum optics
  • Laser physics

Background:

  • Superfluorescence (SF) is a coherent emission process in dense atomic systems.
  • Quantum interference effects can significantly modify light-matter interactions.

Purpose of the Study:

  • To investigate laser-induced quantum interference in extreme ultraviolet superfluorescence (SF).
  • To explore the control of SF pulse splitting in a Λ-type helium gas system.

Main Methods:

  • Utilizing a dense gas of Λ-type helium atoms.
  • Coupling the atomic system with a coherent visible laser field.
  • Analyzing the resulting extreme ultraviolet superfluorescence emission.

Main Results:

  • Observed splitting of SF into two distinct pulses due to constructive interferences.
  • Demonstrated control over pulse splitting via gas density and driving laser intensity.
  • Identified constructive interatomic and intraatomic interference as the underlying mechanism.

Conclusions:

  • Quantum interference provides a mechanism to control SF pulse dynamics.
  • The controllable two-pulse SF emission is promising for pump-probe spectroscopy applications.