@article {19749, title = {High-pressure ammonia adsorption and dissociation on clean Fe(111) and oxygen-precovered Fe(111) studied by sum frequency generation vibrational spectroscopy}, journal = {Journal of Physical Chemistry B}, volume = {108}, number = {20}, year = {2004}, note = {Times Cited: 22}, pages = {6374-6380}, author = {Westerberg, S. and Wang, C. and Chou, K. and Somorjai, G. A.} }