[1] Penn State Univ, Davey Lab 152, Dept Chem, University Pk, PA 16802 USA
[2] Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA
[3] Penn State Univ, Dept Comp Sci & Engn, University Pk, PA 16802 USA
[4] Univ Penn, Moore Sch Elect Engn, Philadelphia, PA 19104 USA
[5] Natl Inst Stand & Technol, Chem Sci & Technol Lab, Gaithersburg, MD USA