Abstract

Laser-ablated brass plasma plumes expanding in various air pressures have been studied using optical emission spectroscopy and two-dimensional imaging. The velocity of the plume front calculated from the Rt plot decreases from 1.9×104m/s to 5.5×103m/s as the pressure increases from 0.01 to 105Pa. The estimated higher electron temperature for Cu I (510.5 nm) transition than for Zn I (481.1 nm) may be due to differences in the heat of vaporization and vaporization temperature of copper and zinc. The electron density estimated using the Stark-broadened transition 4pP3/224s2D25/2 of Cu I (510.5 nm) is about 10 times higher than that for transition 4s5sS134s4pP23 of Zn I (481.1 nm). The appearance and enhancement of the Cu2 (A–X) band at lower ambient pressure and formation of nanoparticle clusters have been extensively discussed. Stoichiometric and morphological study of the deposited nanoparticles on carbon tape at different ambient pressure reveals a different percentage composition of copper and of nanoparticles.

© 2012 Optical Society of America

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