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We have succeeded in observing optical second harmonic generation (SHG) from steps on the TiO2 surfaces adsorbed with HCOOH. The samples were single crystals of rutile TiO2 with (110), (15 15 4), (13 9 0), and (671) faces. These samples underwent annealing in O2 gas, HF etching, and immersion into HCOOH aqueous solution to adsorb HCOOH molecules on their surfaces. Their surfaces were characterized by reflection high energy electron diffraction (RHEED) and atomic force microscopy (AFM), and weredoi:10.1380/ejssnt.2010.84 fatcat:fctkxpnlknb4hafcboxxqpb63y