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Chemical Ionization (CI) Mass Spectrometry01:21

Chemical Ionization (CI) Mass Spectrometry

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The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
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Mass Analyzers: Common Types01:19

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Molecular Orbital Theory I02:35

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Overview of Molecular Orbital Theory
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Mass Spectrometry: Overview01:19

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Mass spectrometry is an analytical technique used to determine the molecular mass and molecular formula of a compound. The basic principle of mass spectrometry is to generate ions from the analyte molecule and measure these ion abundances against their molecular mass.  One common type of ionization, known as electrospray ionization or EI, bombards the analyte molecules in the gas phase with high-energy electron beams. The electron beams displace an electron from the molecule and leave...
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Mass Spectrometry: Molecular Fragmentation Overview01:20

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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...
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Mass Spectrometers01:16

Mass Spectrometers

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This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
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Updated: Aug 26, 2025

Spatial Separation of Molecular Conformers and Clusters
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Strong-field molecular ionization beyond the single active electron approximation.

J-N Vigneau1, T-T Nguyen-Dang2, E Charron1

  • 1Institut des Sciences Moléculaires d'Orsay, Université Paris-Saclay, CNRS, 91405 Orsay, France.

The Journal of Chemical Physics
|October 8, 2022
PubMed
Summary
This summary is machine-generated.

This study reveals limits of the single-active electron approximation in strong-field ionization. We observed non-monotonous ionization in H2 molecules, showing enhanced ionization and quenching due to overlapping resonances.

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Area of Science:

  • Quantum mechanics
  • Atomic and molecular physics
  • Strong-field physics

Background:

  • The single-active electron approximation simplifies complex quantum systems, particularly in strong-field ionization.
  • Understanding electron-electron interactions is crucial for accurate modeling of molecular ionization dynamics.

Purpose of the Study:

  • To investigate the quantitative limits of the single-active electron approximation for strong-field ionization.
  • To explore the role of electron-electron interactions in the dynamics of H2 single ionization.

Main Methods:

  • Time-dependent configuration interaction method to solve the time-dependent Schrödinger equation.
  • Adiabatic tuning of electron-electron interaction strength.
  • Simulation of H2 ionization using a vibrationally frozen model under intense laser fields.

Main Results:

  • Observed non-monotonous ionization probability profiles for H2 at intermediate internuclear distances.
  • Identified instances of enhanced ionization and partial ionization quenching.
  • Correlated these phenomena with resonance-enhanced multiphoton ionization mechanisms.

Conclusions:

  • The single-active electron approximation has limitations in describing strong-field ionization phenomena in molecules like H2.
  • Electron-electron interactions significantly influence ionization dynamics, leading to complex behaviors.
  • Interfering overlapping resonances play a key role in the observed ionization patterns.