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Related Concept Videos

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,...
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,...
Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the aerosol...
Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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...
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...

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Related Experiment Video

Updated: Jun 26, 2026

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Suppression of decoherence in fast-atom diffraction at surfaces.

F Aigner1, N Simonović, B Solleder

  • 1Institute for Theoretical Physics, Vienna University of Technology, A-1040 Vienna, Austria, EU.

Physical Review Letters
|December 31, 2008
PubMed
Summary

Quantum diffraction of fast neutral atoms at surfaces reveals persistent coherence. Simulations of helium beams on LiF surfaces allow determination of surface structure, aiding decoherence studies.

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Area of Science:

  • Surface science
  • Quantum mechanics
  • Atomic physics

Background:

  • Fast neutral atom scattering at keV energies exhibits quantum diffraction at alkali-halide surfaces.
  • Persistence of quantum coherence under solid-state conditions raises questions about decoherence and the quantum-to-classical transition.

Purpose of the Study:

  • To present an ab initio simulation of quantum diffraction for fast helium beams at a LiF (100) surface.
  • To compare simulation results with experimental diffraction data.
  • To determine LiF surface reconstruction (buckling) from quantitative diffraction image analysis.

Main Methods:

  • Ab initio quantum diffraction simulations.
  • Scattering of fast neutral helium atoms (keV energies) at LiF (100) surface.
  • Analysis of diffraction patterns and quantitative reconstruction of surface structure.

Main Results:

  • Simulated diffraction patterns of helium beams at LiF (100) surface.
  • Comparison between simulated and experimental diffraction data.
  • Quantitative determination of the vertical LiF-surface reconstruction (buckling).

Conclusions:

  • Ab initio simulations accurately reproduce experimental diffraction patterns.
  • Quantum diffraction provides a sensitive probe for surface structure determination.
  • The study offers insights into decoherence suppression in quantum systems interacting with solid surfaces.