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Updated: Feb 1, 2026
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Analysis of Complex Molecules and Their Reactions on Surfaces by Means of Cluster-Induced Desorption/Ionization Mass Spectrometry
Published on: March 1, 2020
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Modeling on Fragmentation of Clusters inside a Mass Spectrometer
Evgeni Zapadinsky1, Monica Passananti1, Nanna Myllys1
1Institute for Atmospheric and Earth System Research/Physics, Faculty of Science , University of Helsinki , Helsinki , Finland.
The Journal of Physical Chemistry. A
|December 15, 2018
Summary
Atmospheric clusters fragment in mass spectrometers due to acceleration. A new model explains this fragmentation using statistical principles and energy transfer from gas molecule collisions, aiding experimental interpretation.
Area of Science:
- Atmospheric Chemistry
- Physical Chemistry
- Analytical Chemistry
Background:
- Atmospheric clusters are weakly bound structures.
- These clusters can fragment within analytical instruments like mass spectrometers.
- Fragmentation under electric fields deviates from equilibrium conditions.
Purpose of the Study:
- To develop a model for atmospheric cluster fragmentation under external forces.
- To explain energy transfer mechanisms leading to fragmentation.
- To aid in interpreting experimental data from mass spectrometry.
Main Methods:
- Application of basic statistical principles.
- Modeling energy transfer to internal cluster modes via collisions with residual gas molecules.
- Describing fragmentation upon sufficient internal energy accumulation.
Main Results:
- A model for non-equilibrium cluster fragmentation was developed.
- The model accounts for energy transfer from carrier gas collisions.
- Fragmentation is linked to accumulated internal energy.
Conclusions:
- The developed model provides a framework for understanding atmospheric cluster fragmentation in mass spectrometers.
- It offers a method to interpret experimental measurements involving such fragmentation.
- This approach is crucial for accurate analysis of atmospheric clusters.
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