indicating the presence of aluminum oxide. The possibility of oxide formation is strong because of the laser induced breakdown of the water, which used as a confining medium for the plasma. The PL measurement using excitation source of Xenon lamp shows a broad peak which could be resolved using different excitation wavelengths. 

The peak position shifts towards longer wavelength as the excitation wavelength is changed to  longer wavelengths. The shift may be due to the presence of intermediate compounds like AlO and Al₂O in addition to Al₂O₃ .The amalgamation of some the excited electronic - vibrational bands of the intermediate compounds may contribute to the broad observed PL peak. The appearance of the luminescence bands may be associated with the defects  formed in the non equilibrium phases and the oxygen vacancy defects in the sub-lattice which are specific features of the nanostructured state in nanostructures formed during the laser ablation inside the liquid confined ambient. A comparative study of laser ablated aluminum plasma in air and water to elucidate the various processes is also presented.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/20393 must be provided.

1. Gas suspended ZnO clusters and pulsed laser deposition of ZnO thin film