The behavior of D2O ice on CO/Pt(111) and Pt(111) under the irradiation of near-IR pulses (NIR) was studied by sum-frequency generation (SFG) spectroscopy. The peaks assigned to the O-D stretching modes of ice were obtained for the first 30 molecular layers on Pt(111). When the D2O/CO/Pt(111) was irradiated, the signal of D2O was weakened after 500 ps, but that of CO was weakened immediately after the pumping. A similar time response was observed for the D2O peak in D2O/Pt(111). The weakening of SFG is attributed to the broadening of bands due to thermal excitation. This indicates that the energy of the pump pulse is deposited on the Pt(111) surface and diffused into the layers of D2O ice in the 500 ps timescale. (C) 2002 Elsevier Science B.V. All rights reserved.