Electron Attachment and Electron Ionization of Helium Droplets Containing Clusters of C60 and Formic Acid

Masoomeh Mahmoodi-Darian; Elias Jabbour Al Maalouf; Samuel Zöttl; Paul Scheier; Olof Echt

doi:10.1016/j.ijms.2020.116293

paper

Electron Attachment and Electron Ionization of Helium Droplets Containing Clusters of C60 and Formic Acid

arXiv:2211.10133 · doi:10.1016/j.ijms.2020.116293

Abstract

High-resolution mass spectra of helium droplets doped with C $_{60}$ and formic acid (FA) are ionized by electrons. Positive ion mass spectra reveal cluster ions [(C $_{60}$ ) $_{p}$ FA $_{n}$ ] $^{+}$ together with their hydrogenated and dehydrogenated counterparts. Also observed are ions containing one or more water (W) molecules. The abundance distributions of these ions reveal several interesting features: i) [(C $_{60}$ ) $_{p}$ FA $_{n}$ ] $^{+}$ ions are more abundant than hydrogenated [(C $_{60}$ ) $_{p}$ FA $_{n}$ H] $^{+}$ ions even though the opposite is true in the absence of C $_{60}$ (i.e. if $p$ = 0); ii) although [C $_{60}$ FA] $^{+}$ is the most abundant ion containing a single C $_{60}$ , multiple C $_{60}$ suppress the [(C $_{60}$ ) $_{p}$ FA] $^{+}$ signal; iii) an enhanced stability of [(C $_{60}$ ) $_{p}$ W $_{1}$ FA $_{5}$ H] $^{+}$ and [(C $_{60}$ ) $_{p}$ W $_{2}$ FA $_{6}$ H] $^{+}$ mirrors that of [W $_{1}$ FA $_{5}$ H] $^{+}$ and [W $_{2}$ FA $_{6}$ H] $^{+}$ , respectively. On the other hand, the enhanced stability of [C $_{60}$ FA $_{6}$ H] $^{+}$ finds no parallel in the stability pattern of [FA $_{n}$ H] $^{+}$ or FA $_{n}$ $^{+}$ . Negative ion mass spectra indicate a propensity for non-dissociated [(C $_{60}$ ) $_{p}$ FA $_{n}$ ] $^{-}$ anions if $p \geq 1$ which contrasts with the dominance of dehydrogenated [FA $_{n}$ -H] $^{-}$ anions.

10 pages, 5 figures

Electron Attachment and Electron Ionization of Helium Droplets Containing Clusters of C60 and Formic Acid

Abstract

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