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Chemical Ionization (CI) Mass Spectrometry01:21

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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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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Are multi-quasiparticle interactions important in molecular ionization?

Carlos Mejuto-Zaera1, Guorong Weng2, Mariya Romanova2

  • 1University of California, Berkeley, California 94720, USA.

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|April 3, 2021
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Summary
This summary is machine-generated.

Accurately predicting molecular electronic spectra requires accounting for many-body effects. Vertex corrections in GWΓ calculations significantly improve theoretical photo-emission spectra, capturing complex satellite structures and multiple quasiparticles (QPs).

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Area of Science:

  • Quantum Chemistry
  • Spectroscopy
  • Computational Physics

Background:

  • Photo-emission spectroscopy reveals electronic states and many-body correlations.
  • Accurate theoretical descriptions are needed, especially for complex inner valence excitations.
  • The breakdown of the single quasiparticle (QP) picture complicates spectral predictions.

Purpose of the Study:

  • To compute and analyze full valence photo-emission spectra for small molecules.
  • To compare different many-body perturbation theory methods, including GW and GWΓ.
  • To assess the impact of vertex corrections on spectral accuracy.

Main Methods:

  • Utilizing the fully correlated adaptive sampling configuration interaction method.
  • Employing many-body perturbation theory, specifically GW and vertex-corrected GWΓ (GWΓ) approaches.
  • Calculating and comparing full valence spectra across independent and interacting QP regimes.

Main Results:

  • GWΓ calculations universally improve theoretical photo-emission spectra for molecular systems.
  • Vertex corrections are crucial for accurate QP predictions and satellite structure identification.
  • GWΓ provides a unified description across various energy scales.

Conclusions:

  • The multi-QP regime in molecular spectra arises from dynamical correlations.
  • Perturbation theory, particularly with vertex corrections (GWΓ), accurately describes these correlations.
  • GWΓ is essential for precise predictions in computational spectroscopy.