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Related Concept Videos

Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

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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,...
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Atomic Fluorescence Spectroscopy01:29

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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...
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Atomic Absorption Spectroscopy: Interference01:25

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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,...
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Atomic Emission Spectroscopy: Instrumentation01:22

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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Atomic Force Microscopy01:08

Atomic Force Microscopy

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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.
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Related Experiment Video

Updated: May 2, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Molecular interferometer to decode attosecond electron-nuclear dynamics.

Alicia Palacios1, Alberto González-Castrillo, Fernando Martín

  • 1Departamento de Química, Universidad Autónoma de Madrid, 28049 Madrid, Spain.

Proceedings of the National Academy of Sciences of the United States of America
|March 5, 2014
PubMed
Summary

This study introduces a novel molecular interferometer using twin extreme ultraviolet (XUV) pulses. This method precisely maps electronic and nuclear molecular dynamics and autoionization processes.

Keywords:
XUV pump-probe spectroscopyattosecond molecular dynamicsfree electron lasershigh harmonic generation

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Area of Science:

  • Molecular Dynamics
  • Quantum Control
  • Attosecond Science

Background:

  • Understanding coupled electronic and nuclear dynamics is crucial for molecular control.
  • Short-wavelength, ultrashort laser pulses like extreme ultraviolet (XUV) are ideal for probing molecular systems without distortion.

Purpose of the Study:

  • To propose and theoretically demonstrate a novel pump-probe scheme for complete characterization of molecular dynamics.
  • To utilize a molecular interferometer based on direct and sequential two-photon ionization using twin XUV pulses.

Main Methods:

  • Theoretical modeling of molecular systems subjected to ultrashort XUV pulses.
  • Implementation of a pump-probe scheme with two synchronized XUV pulses.
  • Analysis of direct and sequential two-photon ionization pathways.

Main Results:

  • The proposed scheme enables complete identification of electronic and nuclear phases in the generated wave packet.
  • Total ionization yields reveal entangled electronic and nuclear dynamics in bound states.
  • Doubly differential yields expose autoionization dynamics and electron correlation in the ionization continuum.

Conclusions:

  • Twin XUV pulses can create a molecular interferometer for detailed dynamics studies.
  • This method allows for the visualization of coupled electronic-nuclear dynamics and autoionization.
  • The approach offers a powerful tool for advancing molecular science and quantum control.