On the Rydberg transitions and elemental compositions in the laser produced Al (6063) plasma

Abstract

We present new studies on the optical emission spectra of the laser produced Al 6063 alloy plasma generated by the 1064 nm Nd: YAG laser. The spectrum reveals Rydberg transitions; nd 2D3/2,5/2 → 3p 2P1/2,3/2 (n = 3 – 8), ns 2S1/2 → 3p 2P1/2,3/2 (n = 4–6), and the dominant spectral lines of the other constituent elements. We have extracted the relative abundance of the impurities using the relative intensity ratio method. Besides, we have calculated the electron temperature (∼7580 K) from the Boltzmann plot method and the electron number densities (∼1.4 × 1017/cm3) from the Stark widths of the aluminum spectral lines. The plasma parameters determined in the present work are in agreement with that reported in the literature. The molecular vibrational transitions of the AlO free radical associated with the B 2∑→X 2∑ band system have also been identified.