INITIAL PROCESS OF CLUSTER FORMATION OF LASER-ABLATED Si PARTICLES
| Autor: | Takasumi Ohyanagi, Osamu Yoda, Kouichi Murakami, Atsumi Miyashita |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Materials science
Helium gas chemistry.chemical_element Surfaces and Interfaces Condensed Matter Physics Laser Surfaces Coatings and Films law.invention Plume chemistry law Scientific method Physics::Atomic and Molecular Clusters Materials Chemistry Free expansion Cluster (physics) Atomic physics Absorption (chemistry) Helium |
| Zdroj: | Surface Review and Letters. :187-190 |
| ISSN: | 1793-6667 0218-625X |
| DOI: | 10.1142/s0218625x96000371 |
| Popis: | We have performed x-ray absorption measurements of laser-ablated Si particles in vacuum and in Hegas environment. It is found that the spatial distributions of laser-ablated particles are very different between the two cases. This suggests that a higher-density region of helium gas is formed at the top of the plume of the ablated particles, and free expansion of particles is restrained by this helium cloud. Moreover, the spectrum obtained at 260 ns indicates that it takes more than 260 ns to form Si clusters. It is also demonstrated that Al particles can be sputtered in vacuum by laser-ablated Si particles if an Al plate is placed in front of the plume. |
| Databáze: | OpenAIRE |
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