Quantum chemistry of vibrations on surfaces using cluster models

COLL 140

Krishnan Raghavachari, Department of Chemistry, Department of Chemistry, Indiana University, Bloomington, IN 47405
The assignment of vibrational bands seen in infrared and Raman spectroscopic studies of surfaces is often a challenging problem. Quantum chemical calculations on appropriate cluster models have played a key complementary role in the assignment and understanding of many such vibrational studies on surfaces. In this talk, selected examples will be presented from our work on wet and dry oxidation of silicon, hydrogenation and oxidation of indium phosphide, and the study of point-defects and pH-dependent surface chemistry of silica. The close relationship between theory and experiment and some novel structural assignments will be highlighted.