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. 2019 Apr;15(Suppl 350):144-147.
doi: 10.1017/S1743921319007567. Epub 2020 Oct 12.

Laboratory evidence for the formation of hydrogenated fullerene molecules

J D Thrower  1 , G Pantazidis  1 , M Scheffler  1 , F D S Simonsen  1 , P A Jensen  1 , L Hornekær  1   2
Affiliations

Laboratory evidence for the formation of hydrogenated fullerene molecules

J D Thrower et al. Proc Int Astron Union. 2019 Apr.

Abstract

Experimental evidence for the formation of hydrogenated fullerene molecules is presented. Films of C60 were grown on a highly oriented pyrolytic graphite (substrate) and exposed to a beam of deuterium atoms. Thermal desorption combined with mass spectrometry was used to determine the deuterated fullerene products formed, revealing a maximum degree of deuteration corresponding to C60D36. Release of D2 from the deuterated C60 film occurs at a much higher temperature than for D-saturated graphite.

Keywords: astrochemistry - methods; clouds; laboratory - ISM; molecules - ISM; physical data and processes.

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Figures

Figure 1
Figure 1
Mass spectra of desorption products for (a) Pristine C60 adsorbed on HOPG and (b-c) C60 on HOPG increased to increasing D-atom fluences.
Figure 2
Figure 2
(a) (i) Thermal desorption of ca. 1 ML of pristine C60 from HOPG, (ii) summed desorption signal of all C60Dx species with 0 ≤ x ≤ 36 for ca. 1 ML C60 on HOPG exposed to a D-atom fluence of 7.2 × 1017 cm−2, (b) Thermal desorption of D2 from D-saturated HOPG showing characteristic desorption peaks corresponding to para and ortho dimers as highlighted, (c) Thermal desorption of D2 from corresponding to (i) in (a).
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