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This study calculates positron scattering cross sections for several molecules, finding good agreement with experiments except near the positronium formation threshold. These findings aid in modeling charged particle behavior in matter.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Scattering Theory
  • Materials Science

Background:

  • Positron scattering data is crucial for understanding particle interactions in various materials.
  • Existing data for positron interactions with structurally related molecules is limited and fragmented.
  • Total cross sections (TCSs) are vital for modeling charged particle tracks and mean-free paths in matter.

Purpose of the Study:

  • To compute integral elastic, momentum transfer, and inelastic cross sections for positron scattering from formamide, formylphosphine, formic acid, N-methylformamide, acetone, acetic acid, and formaldehyde.
  • To address the scarcity of positron scattering data for these specific molecular targets.
  • To compare calculated TCSs with existing experimental literature and analyze discrepancies.

Main Methods:

  • Utilized the optical potential approach for calculating cross sections.
  • Employed the complex scattering potential-ionization contribution method.
  • Calculations were performed for impact energies ranging from 1 to 5 keV.

Main Results:

  • Computed novel cross section data for elastic, momentum transfer, and inelastic positron scattering from the studied molecules.
  • Observed good qualitative agreement between calculated TCSs and experimental data below and above the positronium formation threshold.
  • Identified a significant discrepancy around the threshold region, potentially due to experimental limitations in discriminating forward angle scattering.

Conclusions:

  • The calculated cross sections provide valuable new data for positron-molecule interactions.
  • The study highlights the importance of accurate scattering data for simulations in materials science and radiation physics.
  • Discrepancies at the threshold underscore the need for refined experimental techniques and further theoretical investigations.