Electron-induced chemistry in imidazole clusters embedded in helium nanodroplets
Eur. Phys. J. D 72 (2018) 38 Electron-induced chemistry in imidazole (IMI) clusters embedded in helium nanodroplets (with an average size of 2$\times$10$^5$ He atoms) has been investigated with high-resoluton time-of-flight mass spectrometry. The formation of both, negative and positive, ions was mo...
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| Main Authors: | , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
02-05-2018
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Eur. Phys. J. D 72 (2018) 38 Electron-induced chemistry in imidazole (IMI) clusters embedded in helium
nanodroplets (with an average size of 2$\times$10$^5$ He atoms) has been
investigated with high-resoluton time-of-flight mass spectrometry. The
formation of both, negative and positive, ions was monitored as a function of
the cluster size n. In both ion spectra a clear series of peaks with IMI
cluster sizes up to at least 25 are observed. While the anions are formed by
collisions of IMI$_n$ with He$^\star$$^{-}$, the cations are formed through
ionization of IMI$_n$ by He$^{+}$ as the measured onset for the cation
formation is observed at 24.6 eV (ionization energy of He). The most abundant
series of anions are dehydrogenated anions IMI$_{n-1}$(IMI-H)$^{-}$, while
other anion series are IMI clusters involving CN and C$_2$H$_4$ moieties. The
formation of cations is dominated by the protonated cluster ions
IMI$_n$H$^{+}$, while the intensity of parent cluster cations IMI$_n$$^{+}$ is
also observed preferentially for the small cluster size n. The observation of
series of cluster cations [IMI$_n$CH$_3$]$^{+}$ suggests either CH$_3$$^{+}$
cation to be solvated by n neutral IMI molecules, or the electron-induced
chemistry has led to the formation of protonated methyl-imidazole solvated by
(n-1) neutral IMI molecules. |
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| DOI: | 10.48550/arxiv.1805.00797 |