1. Chemistry
Division, Branch 6120, Naval Research Laboratory, Washington, D.C. 20375-5320, United States
2. Acoustics
Division, Branch 7130, Naval Research Laboratory, Washington, D.C. 20375-5320, United States
3. Department
of Materials Science and Engineering, The Pennsylvania State University, 310 Steidle
Building, University Park, Pennsylvania 16802, United States