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• W2046258977 startingPage "382" @default.
• W2046258977 abstract "We report on the laser ablation of Si in vacuum, and in the presence of helium ambient at 1 and 10 Torr, respectively. The silicon nanoparticles were deposited on silicon substrate at room temperature by ablating silicon wafer in ambient atmosphere of helium at 1 Torr. The mean cluster size ranging from 1.8 to 4.4 nm is observed depending on the laser intensity. Optical emission spectroscopy and images of the plume are used to study the spatial and temporal variation of the silicon plasma. The electron density, measured by the Stark-broadening of Si I transition 3p21S–4s1P0 at 390.55 nm and temperature, assuming thermal equilibrium, were found to be 1.2×1018 cm−3 and 2 eV, respectively. The temporal variation of Si I transition 3p21S–4s1P0 at 390.55 nm showed a shift in peak position attributed to collisions at an early stage of plasma formation. The relative concentration of Si II/Si I estimated by using the Saha–Boltzmann relation showed abundance of Si I. Time resolved images of the plume were used to investigate the dynamics of the expanding plasma plume, estimating the vapor pressure, vapor temperature, velocity, and stopping distance of the plume. The photoluminescent spectra of the Si thin films showed three distinct emission bands at 2.7, 2.2 and 1.69 eV, the origin of these bands is attributed to defects and quantum confinement." @default.
• W2046258977 created "2016-06-24" @default.
• W2046258977 creator A5081506601 @default.
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• W2046258977 date "2004-01-01" @default.
• W2046258977 modified "2023-09-27" @default.
• W2046258977 title "Emission spectroscopy of laser-ablated Si plasma related to nanoparticle formation" @default.
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• W2046258977 doi "https://doi.org/10.1016/j.apsusc.2003.09.038" @default.
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