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Dissociative electron attachment to N2O using velocity slice imaging.

Dhananjay Nandi1, Vaibhav S Prabhudesai, E Krishnakumar

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This study reveals new insights into negative ion resonances in nitrous oxide (N2O) using velocity slice imaging. Novel momentum distributions and dissociation dynamics were observed for key electron attachment resonances.

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Area of Science:

  • Chemical Physics
  • Atomic and Molecular Physics
  • Quantum Chemistry

Background:

  • Dissociative electron attachment (DEA) is a key process in understanding molecular interactions.
  • Negative ion resonances play a crucial role in DEA mechanisms.
  • Nitrous oxide (N2O) is a molecule of interest due to its atmospheric and chemical significance.

Purpose of the Study:

  • To investigate the structure and dynamics of negative ion resonances in N2O.
  • To analyze the O(-) channel in dissociative electron attachment.
  • To explore previously unstudied resonances at 8.1 eV and 13.2 eV.

Main Methods:

  • Velocity slice imaging technique was employed for high-resolution measurements.
  • Analysis of distinct momentum distributions of O(-) ions.
  • Characterization of dissociation dynamics and angular distributions for various resonances.

Main Results:

  • Observed novel momentum distributions for dominant N2O(-) resonances below 4 eV.
  • Reported significantly different distributions compared to previous studies.
  • Identified and studied dynamics of weaker resonances at 8.1 eV and 13.2 eV for the first time.
  • Revealed two distinct dissociation channels with differing angular distributions for higher energy resonances.

Conclusions:

  • The findings provide a more detailed understanding of N2O(-) resonances and DEA pathways.
  • The new data challenges existing models and suggests complex dynamics.
  • This research opens avenues for further theoretical and experimental investigations into electron-molecule interactions.