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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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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Manipulating atomic fragmentation processes by controlling the projectile coherence.

K N Egodapitiya1, S Sharma, A Hasan

  • 1Department of Physics and LAMOR, Missouri University of Science & Technology, Rolla, Missouri 65409, USA.

Physical Review Letters
|May 17, 2011
PubMed
Summary
This summary is machine-generated.

Projectile beam preparation is crucial for accurate quantum mechanical scattering calculations. Experimental results reveal interference patterns in proton-hydrogen molecule collisions, highlighting this overlooked aspect in atomic scattering theory.

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Last Updated: Jun 2, 2026

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08:51

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Published on: August 18, 2017

A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation
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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

Area of Science:

  • Atomic and Molecular Physics
  • Quantum Mechanics
  • Chemical Physics

Background:

  • Proton-hydrogen molecule (p+H2) collisions are fundamental in understanding atomic interactions.
  • Previous theoretical models often overlooked the impact of projectile beam preparation on scattering dynamics.
  • Quantum interference phenomena are critical in describing indistinguishable scattering events.

Purpose of the Study:

  • To investigate the scattering angle dependence of ionization cross sections in p+H2 collisions.
  • To determine the influence of projectile coherence on interference patterns in atomic scattering.
  • To highlight the necessity of including beam preparation in theoretical atomic scattering calculations.

Main Methods:

  • Experimental measurement of cross sections for ionization in p+H2 collisions.
  • Analysis of scattering angle dependence at fixed projectile energy loss.
  • Comparison of experimental data with theoretical predictions considering projectile coherence.

Main Results:

  • Observed variations in interference patterns based on projectile coherence.
  • Demonstrated the presence or absence of interference due to indistinguishable diffraction.
  • Confirmed the significant impact of projectile preparation on observed scattering phenomena.

Conclusions:

  • Projectile beam preparation is a critical factor in quantum mechanical scattering calculations.
  • Experimental findings necessitate revisions in formal atomic scattering theory.
  • The study underscores a long-standing oversight in theoretical approaches to atomic collisions.