Journal
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
Volume 280, Issue 1-3, Pages 26-31Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijms.2008.07.009
Keywords
Helium droplets; CCl4; Soft ionization
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Electron impact ionization of helium nano-droplets containing several 10(4) He atoms and doped with CCl4 or SF6 molecules is studied with high-mass resolution. The mass spectra show significant clustering of CCl4 molecules, less so for SF6 under our experimental conditions. Positive ion efficiency curves as a function of electron energy indicate complete immersion of the molecules inside the helium droplets in both cases. For CCl4 we observe the molecular parent cation CCl4+ that preferentially is formed via Penning ionization upon collisions with He*. In contrast, no parent cation SF6+ is seen for He droplets doped with SF6. The fragmentation patterns for both molecules embedded in He are compared with gas phase studies. Ionization via electron transfer to He+ forms highly excited ions that cannot be stabilized by the surrounding He droplet. Besides the atomic fragments F+ and Cl+ several molecular fragment cations are observed with He atoms attached. (C) 2008 Elsevier B.V. All rights reserved.
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