Mass spectrometry
He tagging maps copper cluster ion shapes
Open access · cc by · source: Europe PMC
Helium nanodroplet mass spectrometry of 63Cu clusters shows magic He shells that match computed binding sites, including twisted-X Cu5+.
Study at a glance
- Design
- Computational / modelling — He nanodroplet mass spectra of Cu clusters compared with MP2 He-binding calculations
- N
- Gas-phase cluster experiment plus theory — no sample N
- Population
- Copper cluster ions solvated by helium in nanodroplets
- Outcome
- Magic-number structures and He-shell closing around Cu_n^+/−
Structured fields used in claim comparison tables when every cited study has a complete layer.
Key findings
Cu+ closes a shell at 6 He (octahedron). Cu5+ is the smallest 3D cluster, twisted-X, with a strong m = 4 magic number (~70 meV above a bipyramid). Anions bind more He at similar pressures.
Methodology
Authors ionized He nanodroplets, picked up monoisotopic 63Cu, evaporated with He gas, and compared magic He_mCu_n^+/− intensities with MP2 He-binding calculations.
Limitations
Structures are inferred from tagging, not a crystal; large-m magic numbers are noisy; anions have isobaric impurity risks at m = 7, 9.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
This library holds 5 empirical chemistry papers on mass spectrometry with isolated findings, rates or spectra rather than reviews.
Evidence for the claim as stated.
Helium nanodroplet mass spectrometry of 63Cu clusters shows magic He shells that match computed binding sites, including twisted-X Cu5+.
Evidence for the claim as stated.
Soft ionisation preserves complexes that harsh ionisation destroys; imaging spatial resolution and native versus denaturing conditions are different experiments.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
Soft ionisation preserves complexes that harsh ionisation destroys; imaging spatial resolution and native versus denaturing conditions are different experiments.
Related papers in this topic
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