open access

https://hdl.handle.net/2115/50221

Photoinduced Surface Dynamics of CO Adsorbed on a Platinum Electrode

英語

2006-08-10

American Chemical Society

Journal of Physical Chemistry B

110(31)

15055-15058

The surface dynamics of adsorbed CO molecules formed by dissociative adsorption of HCHO at a polycrystalline Pt electrode/electrolyte solution interface was studied by picosecond time-resolved sum-frequency generation (TR-SFG) spectroscopy. A SFG peak at 2050-2060 cm^[-1] was observed at the Pt electrode in HClO4 solution containing HCHO at 0-300 mV (vs Ag/AgCl), indicating the formation of adsorbed CO at an atop site of the Pt surface as a result of dissociative adsorption of HCHO. The peak position varied with potential by ～33 cm^[-1]/V, as previously found in an infrared reflection absorption spectroscopy (IRAS) study. Irradiation of an intense picosecond visible pulse (25 ps, 532 nm) caused an instant intensity decrease and broadening of the CO peak accompanied by the emergence of a new broad peak at ～1980 cm^[-1] within the time resolution of the system. These results suggest a decrease and increase in the populations of CO adsorbed on atop and bridge sites, respectively, upon visible pump pulse irradiation.

学術雑誌論文

Version of Record

1520-6106

1520-5207