[1] So Illinois Univ, Dept Chem, Edwardsville, IL 62026 USA
[2] Univ Wisconsin, Dept Chem, Madison, WI USA
[3] Lawrence Univ, Dept Chem, Appleton, WI 54912 USA
[4] Beloit Coll, Dept Chem, Beloit, WI 53511 USA
[5] Univ Wisconsin, Dept Engn Phys, Madison, WI USA
[6] Natl Sci Fdn, Div Chem, Arlington, VA 22230 USA