Structural analysis demonstrates intermolecular distance contraction in pyrene dimer cations inside superfluid helium droplets, highlighting electron diffraction as an effective probe.
core, while pyrene dimers demonstrate a change in the intermolecular distance, from 3.5 Å for neutral dimers to 3.0 Å for cations. Future improvements in reducing the background of helium, and in expanding the information content of electron diffraction such as detection of charge distributions, are also discussed.
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Zhang et al. (2022) studied this question.
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