@article {19737, title = {Probing the charge-transfer state of CO on Pt(111) by two-dimensional infrared-visible sum frequency generation spectroscopy}, journal = {Physical Review B}, volume = {69}, number = {15}, year = {2004}, note = {Times Cited: 17}, author = {Chou, K. C. and Westerberg, S. and Shen, Y. R. and Ross, P. N. and Somorjai, G. A.} }