Cairo University

MTPR Journal

 

ANALYSIS OF PLASMA PRODUCED BY LASERABLATION FOR COPPER

& doi: https://doi.org/10.1142/9789814317511_0021
A. I. REFAIE, I. EL GHAZALI, S. H. ALLAM and Th. M. EL SHERBINI
Laboratory of Lasers and new Materials, Department of Physics, Faculty of Science, Cairo Unversity, Giza, Cairo, Egypt

Vol./Issue: 11 , id: 324

A time-resolved diagnostic technique was used to investigate the emission spectra from the copper plasma produced by the high power Q-switched Nd : YAG laser that generates 670 mJ pulses in 6 ns of duration at a frequency 10 Hz and 1064 nm pulse-laser ablation in air. Spectroscopic measurements were devoted to determine the plasma temperature by using Boltzmann plot for the spectral lines of Cu I which are free from self-absorption. Electron number density was also deduced from the stark broadening measurements for different delay times (0.5-10 μs) under the assumption of local thermodynamical equilibrium (LTE). Branching ratios for the some experimental relative transition probabilities have been determined. Calculations with a relativistic Hartree-Fock wavefunctions have been carried out for Cu II in order to place the experimental data on an absolute scale. The Results are compared with that measured and with the available data in literature.