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The submersion of sodium clusters in helium nanodroplets: Identification of the surface → interior transition
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10.1063/1.3610388
/content/aip/journal/jcp/135/4/10.1063/1.3610388
http://aip.metastore.ingenta.com/content/aip/journal/jcp/135/4/10.1063/1.3610388
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Figures

Image of FIG. 1.
FIG. 1.

Schematic of the experimental apparatus. The helium nanodroplets are generated by supersonic expansion in the cluster source region (I) and pass through a 10 cm to 20 cm long pick-up region (II) before they enter the ionization chamber (III). In this chamber the nanodroplets interact with an electron beam and cations are formed. The resulting cations are then mass analyzed by a time-of-flight mass spectrometer (IV).

Image of FIG. 2.
FIG. 2.

Plot of the measured abundance of Na n + cluster ions as a function of n obtained at an electron impact energy of 77 eV.

Image of FIG. 3.
FIG. 3.

Ion yield as a function of electron energy for Na17 + and Na19 +. The error bars were obtained from Poisson statistics, i.e., the assumption that the error is proportional to √N where N is the number of ion counts in a particular m/z channel. The arrow marks the point where the ion yield begins to grow above the background level.

Image of FIG. 4.
FIG. 4.

Ion yield as a function of electron energy for Na21 +, Na23 +, Na27 +, and Na31 +. The arrow marks the point where the ion yield begins to grow above the background level.

Image of FIG. 5.
FIG. 5.

Abundance distributions for the even-numbered sodium cluster ions, Na n +. Because the signal was weak for a given n, for reasons that are well-known, the statistics are poor for individual values of n. Consequently, the data are presented here as two curves which result from the sum of all even-numbered ion signals in the range 10 ≤ n ≤ 20 and for n > 20, respectively. Distinct differences in the thresholds for ion yield increases are seen for the two curves. The arrow marks the point where the ion yield begins to grow above the background level.

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/content/aip/journal/jcp/135/4/10.1063/1.3610388
2011-07-27
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The submersion of sodium clusters in helium nanodroplets: Identification of the surface → interior transition
http://aip.metastore.ingenta.com/content/aip/journal/jcp/135/4/10.1063/1.3610388
10.1063/1.3610388
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