Vibrational dynamics of CO at the (100) platinum electrochemical interface

✍ Scribed by A. Peremans; A. Tadjeddine; P. Guyot-Sionnest

• Book ID: 103032044
• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 402 KB
• Volume: 247
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(95)01221-8

✦ Synopsis

The vibrational relaxation of the CO stretching vibration when the molecule is adsorbed at a (100) platinum single crystal electrode in aqueous electrolyte is investigated by sum-frequency generation. The measured vibration lifetime of 1.5 + 0.5 ps is in line with those previously observed for dry CO/metal interfaces. No lifetime modification upon electrode potential shift of 0.5 V could be detected. Consequently, the electrolyte or the interfacial electric field has little effect on the fast vibrational dynamics resulting from the non-adiabatic coupling of the vibration to the substrate electrons. It is speculated that the observation of a significant lifetime modification upon electrode potential shift would require non-aqueous electrolytes where the CO/Pt interface can be stable over a larger potential range.