The effect of laser wavelength on emission and particle dynamics of Sn plasma

作者: D. Campos , S. S. Harilal , A. Hassanein

DOI: 10.1063/1.3493118

关键词: Atomic physicsIonEmission spectrumPlasma diagnosticsExtreme ultravioletMaterials scienceLaserSpectroscopyLaser-induced breakdown spectroscopyFaraday cup

摘要: We investigated the effects of laser wavelength on atomic, ionic, and radiative emission from laser-produced tin plasmas. For generating plasmas, planar targets were excited using either high intensity neodymium-doped yttrium aluminum garnet (Nd:YAG, 1.06 μm) or carbon dioxide (CO2, 10.6 μm) pulses; both are considered to be potential excitation lasers for an extreme ultraviolet (EUV) lithography plasma light source. Various diagnostic tools utilized investigating neutral, Sn plasmas including Faraday cup, witness plate in conjunction with x-ray photoelectron spectroscopy (XPS), EUV, visible photography. Atomic ionic analysis showed that amount debris emitted by Nd:YAG generated was considerably higher than CO2 The angular distributions atomic found more forward-centric 1.06 μm while being much...

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