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An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with an...
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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The allyl systems have identical molecular orbitals but differ in the number of π electrons.

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Multiphoton electron angular distributions from laser-aligned CS2 molecules.

Vinod Kumarappan1, Lotte Holmegaard, Christian Martiny

  • 1Department of Chemistry, University of Aarhus, 8000 Aarhus C, Denmark.

Physical Review Letters
|March 21, 2008
PubMed
Summary

Laser-aligned carbon disulfide (CS2) molecules showed photoelectron angular distributions dependent on laser polarization angles. The strong-field approximation model qualitatively matched but failed to quantitatively predict these distributions.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Optics
  • Ultrafast Laser Science

Background:

  • Molecular alignment using intense laser fields is crucial for studying anisotropic molecular properties.
  • Multiphoton ionization is a key process for probing electronic structure and dynamics.
  • Understanding photoelectron angular distributions provides insights into ionization mechanisms.

Purpose of the Study:

  • To investigate the angular distribution of photoelectrons from laser-aligned carbon disulfide (CS2) molecules.
  • To examine the influence of the relative polarization angles between aligning and ionizing laser fields.
  • To evaluate the predictive accuracy of the strong-field approximation (SFA) model.

Main Methods:

  • Utilizing intense, linearly polarized 25 fs laser pulses for both molecular alignment and single-photon absorption.
  • Employing multiphoton absorption to ionize laser-aligned CS2 molecules.
  • Measuring the angular distribution of emitted photoelectrons.

Main Results:

  • Observed a significant dependence of photoelectron angular distributions on the angle between the aligning and ionizing laser polarizations.
  • The experimental results showed qualitative agreement with predictions from the strong-field approximation.
  • Quantitative discrepancies were found between the experimental data and the SFA model predictions.

Conclusions:

  • The study highlights the sensitivity of photoelectron angular distributions to molecular alignment and laser polarization.
  • The findings underscore the limitations of the strong-field approximation in quantitatively describing complex ionization dynamics.
  • Further theoretical advancements are needed to accurately model multiphoton ionization of aligned molecules.