Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 16, Issue 41, Pages 22466-22470Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp03236e
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Funding
- Austrian Science Fund, Wien (FWF Projects) [I978, P23657, P26635]
- Austrian Science Fund (FWF) [P23657, I978] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [P 23657, I 978] Funding Source: researchfish
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The mechanism of ionization of helium droplets has been investigated in numerous reports but one observation has not found a satisfactory explanation: How are He+ ions formed and ejected from undoped droplets at electron energies below the ionization threshold of the free atom? Does this path exist at all? A measurement of the ion yields of He+ and He-2(+) as a function of electron energy, electron emission current, and droplet size reveals that metastable He*(-) anions play a crucial role in the formation of free He+ at subthreshold energies. The proposed model is testable.
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