Helium Droplets Doped with Sulfur and C60

Martina Harnisch; Nikolaus Weinberger; Stephan Denifl; Paul Scheier; Olof Echt

doi:10.1021/jp510870x

Helium Droplets Doped with Sulfur and C₆₀

J Phys Chem C Nanomater Interfaces. 2015 May 21;119(20):10919-10924. doi: 10.1021/jp510870x. Epub 2014 Dec 23.

Authors

Martina Harnisch¹, Nikolaus Weinberger¹, Stephan Denifl¹, Paul Scheier¹, Olof Echt²

Affiliations

¹ Institut für Ionenphysik und Angewandte Physik, University of Innsbruck , Technikerstrasse 25, A-6020 Innsbruck, Austria.
² Institut für Ionenphysik und Angewandte Physik, University of Innsbruck , Technikerstrasse 25, A-6020 Innsbruck, Austria ; Department of Physics, University of New Hampshire , Durham, New Hampshire 03824, United States.

Abstract

Clusters of sulfur are grown by passing superfluid helium nanodroplets through a pickup cell filled with sulfur vapor. In some experiments the droplets are codoped with C₆₀. The doped droplets are collided with energetic electrons and the abundance distributions of positively and negatively charged cluster ions are recorded. We report, specifically, distributions of S _m⁺, S _m^-, and C₆₀S _m^- containing up to 41 sulfur atoms. We also observe complexes of sulfur cluster anions with helium; distributions are presented for He _n S _m^- with n ≤ 31 and m ≤ 3. The similarity between anionic and cationic C₆₀S _m^± spectra is in striking contrast to the large differences between spectra of S _m⁺ and S _m^-.