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A velocity map imaging spectrometer for measuring absolute differential cross sections for ion-induced electron
N Sens1, M Ryszka1, J-C Poully1
1Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), UMR 6252, Normandie Université, ENSICAEN, UNICAEN, CEA, CNRS, 14000 Caen, France.
The Review of Scientific Instruments
|September 1, 2022
Summary
We developed a new experimental setup using velocity map imaging (VMI) to study electron emission from molecules during ion collisions. This method precisely measures electron kinetic energy and emission angles, enabling absolute cross-section determination.
Area of Science:
- Atomic and Molecular Physics
- Chemical Physics
- Experimental Physics
Background:
- Understanding electron emission dynamics in ion-molecule collisions is crucial for fields like radiation chemistry and materials science.
- Previous methods often lacked the precision to simultaneously measure electron kinetic energy and emission angles.
- Accurate measurement of differential cross sections is essential for validating theoretical models.
Purpose of the Study:
- To present a novel crossed beam experimental setup for studying collision-induced electron emission.
- To enable simultaneous measurement of electron kinetic energy and emission angle.
- To determine absolute differential cross sections for electron emission in ion-molecule collisions.
Main Methods:
- Utilized a crossed beam apparatus with orthogonal ion and neutral target beams.
- Employed velocity map imaging (VMI) technique for electron analysis.
- Measured projectile ion beam intensity, target density, and beam overlap for absolute cross-section determination.
Main Results:
- Successfully characterized the new experimental setup and methodology.
- Obtained first results for electron emission from uracil upon 0.98 MeV/u 12C4+ collision.
- Demonstrated the capability to measure absolute differential cross sections.
Conclusions:
- The developed VMI-based crossed beam setup is effective for studying electron emission dynamics.
- The methodology allows for precise measurement of absolute differential cross sections.
- This technique provides valuable data for atomic and molecular collision physics.
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