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|Title:||Submersion of potassium clusters in helium nanodroplets|
|Authors:||Lan, L. A. D.|
Maerk, T. D.
Ellis, Andrew M.
|Publisher:||American Physical Society|
|Citation:||Physical Review B, 2012, 85 (11), pp. ?-? (5)|
|Abstract:||Small alkali clusters do not submerge in liquid helium nanodroplets but instead survive predominantly in high spin states that reside on the surface of the nanodroplet. However, a recent theoretical prediction by Stark and Kresin [Phys. Rev. B 81, 085401 (2010)], based on a classical description of the energetics of bubble formation for a fully submerged alkali cluster, suggests that the alkali clusters can submerge on energetic grounds when they exceed a critical size. Following recent work on sodium clusters, where ion yield data from electron impact mass spectrometry was used to obtain the first experimental evidence for alkali cluster submersion, we report here on similar experiments for potassium clusters. Evidence is presented for full cluster submersion at n>80 for Kn clusters, which is in good agreement with the recent theoretical prediction. In an additional observation, we report “magic number” sizes for both Kn+ and Kn2+ ions derived from helium droplets, which are found to be consistent with the jellium model.|
|Rights:||Creative Commons “Attribution Non-Commercial No Derivatives” licence CC BY-NC-ND, further details of which can be found via the following link: http://creativecommons.org/licenses/by-nc-nd/4.0/ Archived with reference to SHERPA/RoMEO and publisher website.|
|Description:||PACS number(s): 68.08.Bc, 36.40.−c|
|Appears in Collections:||Published Articles, Dept. of Chemistry|
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|PhysRevB.85.115414.pdf||Published (publisher PDF)||355.79 kB||Adobe PDF||View/Open|
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