|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 10 van 38 gevonden artikelen
| Titel: |
Ejection of clusters from solid surface by impact of size-selected cluster ion |
| Auteur: |
Yasumatsu, Hisato Yamaguchi, Yasutaka Kondow, Tamotsu |
| Verschenen in: |
Molecular physics |
| Paginering: | Jaargang 106 (2008) nr. 2-4 pagina's 509-520 |
| Jaar: |
2008-01 |
| Inhoud: |
Ejection of clusters from a solid surface by impact of size-selected clusters was investigated by mass spectroscopy and molecular dynamics (MD) simulation. It was found experimentally that carbon cluster anions, [image omitted] (m = 1-12), are ejected from a graphite surface by impact of [image omitted] (N = 1-25) at collision energies (Ecol) of 0.2-14.0 keV per CO2 molecule. A yield, η, of the carbon-atom ejection in the form of Cm- was measured to increase with the 4th power of Ecol as well as the 3.6th power of N, that is, η∼N3.6 [image omitted], and levels off as Ecol increases further. The size distribution of the ejected [image omitted] remains unchanged with Ecol, while the average size, 〈m〉, of [image omitted] increases in proportion to N0.17. On the other hand, MD simulation showed that Cm are produced by recombination of carbon atoms evaporated from a hot surface of a cylindrical crater-shaped defect temporarily formed on the graphite surface by the cluster impact. The Ecol and N dependences of η and 〈m〉 were explained by a thermal desorption model parameterized using the results of the MD simulation. It was concluded that the higher efficiency of the cluster ejection by the larger cluster impact is attained in terms of efficient energy localization in a larger surface area and in a shallower region due to the instantaneous energy deposition by the cluster impact and the fragile nature of graphene sheets. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 10 van 38 gevonden artikelen
| << vorige | volgende >> |