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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

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Cluster cross sections from pickup measurements: are the established methods consistent?

J Fedor¹, V Poterya, A Pysanenko

¹J. Heyrovský Institute of Physical Chemistry v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague, Czech Republic. juraj.fedor@unifr.ch

The Journal of Chemical Physics

|September 22, 2011

Summary

This summary is machine-generated.

Investigating molecule pickup on argon clusters revealed discrepancies between measurement methods. Velocity measurements align with simulations, but Poisson distributions suggest smaller cross-sections, questioning their reliability for cluster analysis.

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Area of Science:

Physical Chemistry
Atomic and Molecular Physics
Cluster Science

Background:

Understanding molecule-cluster interactions is crucial for various chemical and physical processes.
Argon clusters (Ar(N)) serve as model systems for studying solvation and adsorption phenomena.
Accurate determination of pickup cross sections is essential for characterizing these interactions.

Purpose of the Study:

To investigate the pickup of H2O, HBr, and CH3OH molecules and Ar atoms on free argon clusters.
To measure and compare pickup cross sections using two independent experimental methods and computational simulations.
To analyze discrepancies between methods and understand their implications for cluster size and pickup dynamics.

Main Methods:

Molecular beam experiments measuring cluster beam velocity decrease due to momentum transfer.
Analysis of Poisson distributions of cluster fragment ions as a function of pickup pressure.
Molecular dynamics and Monte Carlo simulations to calculate pickup cross sections.

Main Results:

Velocity measurements and simulations showed agreement, supporting the measured pickup cross sections.
Poisson distribution analysis yielded significantly smaller cross sections, inconsistent with known argon cluster sizes.
Discrepancies attributed to incomplete molecule coagulation and fragmentation patterns upon ionization.

Conclusions:

The Poisson distribution method requires careful examination when determining cluster cross sections or mean cluster sizes.
Incomplete coagulation and ionization-induced fragmentation can affect the interpretation of pickup experiments.
Velocity measurements and simulations provide a more consistent picture of molecule pickup on argon clusters.