Repozytorium publikacji - Politechnika Gdańska

Electron impact ionization of helium nano-droplets containing several 104 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.

Autorzy

• Harald Schobel,
• dr inż. Marcin Dampc link otwiera się w nowej karcie ,
• Da Silva Filipe Ferreira,
• Andreas Mauracher,
• Fabio Zappa,
• Stephan Denifl,
• Mark D. Tilmann,
• Paul Scheier