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Title: Ionization of doped helium nanodroplets: residual helium attached to diatomic cations and their clusters.
Authors: Shepperson, B
Liu, J
Ellis, AM
Yang, S
First Published: 30-Jun-2011
Citation: J PHYS CHEM A, 2011, 115 (25), pp. 7010-7016
Abstract: Electron impact ionization of helium nanodroplets containing a dopant, M, can lead to the detection of both M(+) and helium-solvated cations of the type M(+)·He(n) in the gas phase. The observation of helium-doped ions, He(n)M(+), has the potential to provide information on the aftermath of the charge transfer process that leads to ion production from the helium droplet. Here we report on helium attachment to the ions from four common diatomic dopants, M = N(2), O(2), CO, and NO. For experiments carried out with droplets with an average size of 7500 helium atoms, the monomer cations show little tendency to attach and retain helium atoms on their journey out of the droplet. By way of contrast, the corresponding cluster cations, M(n)(+), where n ≥ 2, all show a clear affinity for helium and form He(m)M(n)(+) cluster ions. The stark difference between the monomer and cluster ions is attributed to more effective cooling of the latter in the aftermath of the ionization event.
DOI Link: 10.1021/jp112204e
eISSN: 1520-5215
Type: Journal Article
Appears in Collections:Published Articles, Dept. of Chemistry

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