ISSN:
1432-0630
Schlagwort(e):
PACS: 61.46.tw; 81.05.Tp
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Maschinenbau
,
Physik
Notizen:
Abstract. Laser ablation of graphite in an Ar atmosphere at 560 Torr was done using a nanosecond-pulse Nd:YAG laser (1064 nm) at a fluence of 12 J/cm2. Dynamics in the ejection of carbon species and in their confinement near the graphite surface (〈1 mm) due to their numerous collisions with Ar atoms were investigated by shadowgraphy, emission imaging, and emission spectroscopy at delay times of 0.01–100 μs following the laser irradiation. A shock wave was generated, and temporally and spatially dependent emissions from Ar+ and Ar were observed in addition to those from carbon species (C, C+, and C2) and the Bremsstrahlung radiation from a hot plasma. We suggest that the dissipation of the kinetic and thermal energies of the carbon species, their backward motion, and their collisions with each other lead to the formation of clusters and particles through the interaction with Ar atoms.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/s003399900216
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