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Giant resonances in cold electron scattering by CS(2).

N C Jones1, D Field, J-P Ziesel

  • 1Institute of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark.

Physical Review Letters
|August 23, 2002
PubMed
Summary

Giant resonances in carbon disulfide (CS2) electron scattering were observed below 100 meV. These scattering events, particularly at 49 meV, significantly exceed theoretical predictions, suggesting complex molecular interactions.

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Area of Science:

  • Chemical Physics
  • Atomic and Molecular Physics
  • Electron Scattering

Background:

  • Understanding electron scattering dynamics is crucial for molecular physics.
  • Carbon disulfide (CS2) presents unique electronic properties influencing scattering behavior.

Purpose of the Study:

  • To experimentally investigate the scattering of cold electrons by carbon disulfide (CS2).
  • To characterize integral and backward scattering cross sections across a range of impact energies.
  • To identify and analyze resonance structures and their origins in CS2 electron scattering.

Main Methods:

  • Experimental measurement of electron scattering by CS2.
  • Analysis of integral and backward scattering data.
  • Determination of cross sections for electron impact energies from a few meV to a few hundred meV.

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Main Results:

  • Observed giant resonances with cross sections exceeding 50 A(2) below 100 meV.
  • Identified resonances associated with CS2(-) formation at 15 meV.
  • Observed resonances linked to CS2 vibrational modes (bend and symmetric stretch) at 49 meV and 82 meV.
  • The 49 meV resonance showed a cross section two orders of magnitude larger than predicted by a dipole impulsive model.
  • A sharp rise in scattering cross section at low energy, potentially due to virtual state scattering, was noted.

Conclusions:

  • The study reveals significant resonance structures in cold electron scattering by CS2.
  • Experimental findings challenge existing theoretical models, particularly the dipole impulsive model.
  • The observed phenomena highlight the importance of transient negative ion formation and molecular vibrations in electron-CS2 interactions.