1. Shock Wave Research Laboratory Department of Physics Abdul Kalam Research Center Sacred Heart College Tirupattur Tamil Nadu 635 601 India
2. Department of Physics Kings Engineering College Sriperumbudur Chennai Tamilnadu 602 117 India
3. Department of Chemistry College of Science King Saud University P.O. Box 2455 Riyadh 11451 Saudi Arabia
4. Institue of Materials Research Washington State University Pullman WA 99613 USA