| Autor: |
G. D. Ackerman, Thornton E. Glover, Howard A. Padmore, David Young, Richard W. Lee |
| Rok vydání: |
2004 |
| Předmět: |
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| Zdroj: |
Chemical Physics. 299:171-181 |
| ISSN: |
0301-0104 |
| DOI: |
10.1016/j.chemphys.2003.11.042 |
| Popis: |
The formation of particles in a laser ablation plume is a complex process requiring direct local probes. Here, core-level photoemission spectroscopy is extended to the picosecond time domain to probe local expansion dynamics and associated transient chemical properties as a highly pressurized, metallic fluid expands into vacuum following impulsive heating of a semiconductor by an intense, ultrashort laser pulse. These experiments probe constituents species and solidification kinetics occurring in the early moments of material ejection and provide insight into how particles arise in the current laser ablation regime. Photoemission peak shifts reveal rapid metal–insulator phase transitions and support a view of fragmentation over vapor-condensation as the relevant mechanism determining the initial size-distribution of particles. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect