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Related Experiment Video

Updated: May 24, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F⁻

Published on: July 27, 2018

A momentum imaging microscope for dissociative electron attachment.

H Adaniya¹, D S Slaughter, T Osipov

¹Lawrence Berkeley National Laboratory, Chemical Sciences, Berkeley, California 94720, USA.

The Review of Scientific Instruments

|March 3, 2012

Summary

Researchers developed a new method to image negative ion momentum distributions from dissociative electron attachment (DEA). This technique captures the full 3D momentum sphere for improved molecular dynamics studies.

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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

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Published on: July 27, 2018

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Published on: August 18, 2017

Area of Science:

Chemical Physics
Atomic and Molecular Physics
Physical Chemistry

Background:

Dissociative electron attachment (DEA) is a key process in molecular chemistry.
Understanding the 3D momentum distribution of ions provides insights into DEA dynamics.
Previous methods had limitations in capturing the full momentum spectrum.

Purpose of the Study:

To present a novel experimental approach for imaging the 3D momentum distribution of negative ions.
To validate the performance of the developed apparatus using known DEA resonances.
To enable detailed studies of molecular fragmentation dynamics.

Main Methods:

Utilized a low-energy pulsed electron gun and an effusive gas source.
Employed a 4π solid-angle ion momentum imaging spectrometer with pulsed extraction.
Measured ion time-of-flight and impact position for event-by-event 3D momentum reconstruction.

Main Results:

Successfully imaged the complete 3D anion momentum distributions.
Demonstrated system performance by analyzing H(-) from H2O and O(-) from O2.
Obtained momentum distributions consistent with existing experimental and theoretical data.

Conclusions:

The developed experimental approach provides a comprehensive method for studying DEA.
This technique offers a powerful tool for investigating molecular dissociation pathways.
The results validate the accuracy and capability of the 3D ion momentum imaging spectrometer.