Author/Authors :
Takeshi Kusafuka، نويسنده , , K. and Noguchi، نويسنده , , H. and Onda، نويسنده , , K. and Kubota، نويسنده , , J. and Domen، نويسنده , , K. and Hirose، نويسنده , , C. and Wada، نويسنده , , A.، نويسنده ,
Abstract :
Time-resolved vibrational measurements were carried out on formate (HCOO) adsorbed on Ni(1 1 1) surface by combining the sum-frequency generation method and picosecond laser system (time resolution of 6 ps). Rapid intensity decrease (within the time resolution) followed by intensity recovery (time constant of several tens of ps) of CH stretching signal was observed when picosecond 800 nm pulse was irradiated on the sample surface. From the results of temperature and pump fluence dependences of temporal behaviour of signal intensity, we concluded that the observed intensity change was induced by non-thermal process. Mechanism of the temporal intensity change was discussed.
Keywords :
nickel , laser methods , Vibrations of adsorbed molecules , Sum frequency generation
