1. Department of Physics
2. Periyar University
3. Salem 636 011
4. India
5. College of Chemistry and Chemical Engineering
6. Henan University
7. Kaifeng 475004
8. P. R. China
9. Department of Physics and Astronomy
10. University of Texas at San Antonio
11. San Antonio
12. USA
13. Department of Atomic and Molecular Physics
14. University of Texas at Rio Grande Valley
15. Brownsville