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Related Concept Videos

Mass Spectrometry: Molecular Fragmentation Overview01:20

Mass Spectrometry: Molecular Fragmentation Overview

The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...
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An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...

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Related Experiment Video

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Spatial Separation of Molecular Conformers and Clusters
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Published on: January 9, 2014

Control of electron localization in molecular dissociation.

M F Kling1, Ch Siedschlag, A J Verhoef

  • 1FOM Instituut voor Atoom en Molecuul Fysica (AMOLF), Kruislaan 407, 1098 SJ Amsterdam, Netherlands.

Science (New York, N.Y.)
|April 15, 2006
PubMed
Summary

Scientists precisely controlled electron motion in deuterium molecules using light's electric field. This breakthrough enables controlled electron localization before molecular dissociation, advancing ultrafast chemistry.

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Area of Science:

  • Quantum dynamics
  • Molecular physics
  • Attosecond science

Background:

  • Controlling electron motion is crucial for understanding and manipulating chemical reactions.
  • Ultrafast laser pulses offer potential for precise control over electron dynamics.
  • Molecular dissociation dynamics are complex and influenced by electronic motion.

Purpose of the Study:

  • To demonstrate subcycle control of bound electron motion in molecules.
  • To investigate light-driven intramolecular electronic motion during dissociative ionization.
  • To explore the potential for controlling molecular reaction dynamics using ultrafast light fields.

Main Methods:

  • Utilizing intense, ultrashort laser pulses to interact with deuterium molecules (D2).
  • Analyzing the dissociative ionization pathway (D2 --> D+ + D) via fragment detection.
  • Observing asymmetric ejection of ionic fragments as an indicator of electron localization.

Main Results:

  • Subcycle electric field evolution of light was used to steer bound electrons.
  • Asymmetric ionic fragment ejection confirmed controlled electron localization before dissociation.
  • Demonstrated light-induced intramolecular electronic motion in D2.

Conclusions:

  • Subfemtosecond electron control is achievable in molecules.
  • This technique offers a novel pathway for controlling chemical reaction dynamics.
  • Precise control over electron localization can dictate molecular fragmentation outcomes.