Low-Energy Electron Scattering from Pyrrole and Its Isomers.

Area of Science:

• Chemical Physics
• Theoretical Chemistry
• Atomic and Molecular Physics

Background:

• Pyrrole and its isomers are significant molecules in various scientific domains.
• Understanding electron interactions with these molecules is vital for diverse applications.
• Previous studies have provided foundational data, but detailed low-energy scattering information is still needed.

Purpose of the Study:

• To investigate low-energy electron scattering from pyrrole and its isomers (2-H pyrrole, cyclopropanecarbonitrile, Z-2 butenenitrile).
• To explore the presence of shape and Feshbach resonances in elastic and inelastic scattering channels.
• To calculate various molecular properties and cross sections for these molecules and the pyrrolide anion.

Main Methods:

• Utilized R-matrix theory to model electron scattering.
• Employed minimal STO-3G and advanced DZP basis sets.
• Calculations were performed on a fine energy grid from 0.1 to 12 eV.

Main Results:

• Identified shape and Feshbach resonances for pyrrole and its isomers.
• Observed ultralow-energy resonance for Z-2 butenenitrile at 0.47 eV.
• Estimated elastic, excitation, momentum-transfer, and differential cross sections.

Conclusions:

• The calculated molecular properties and cross sections provide valuable data for astrophysical, astrochemical, atmospheric, and plasma modeling.
• Findings are also relevant to the biomedical field, radiation therapy, and pharmaceutical research.
• The study enhances the understanding of electron-molecule interactions for these important compounds.