arXiv
Open Access
2016
On Subthreshold Ionization of Helium Droplets, Ejection of He+, and the Role of Anions
Michael Renzler
Matthias Daxner
Nikolaus Weinberger
Stephan Denifl
Paul Scheier
+1 lainnya
Abstrak
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.
Topik & Kata Kunci
Penulis (6)
M
Michael Renzler
M
Matthias Daxner
N
Nikolaus Weinberger
S
Stephan Denifl
P
Paul Scheier
O
Olof Echt
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