The Surprisingly Short Vibrational Lifetime of the Internal Stretch of CO Adsorbed on Si(100)
Picosecond sum-frequency generation spectroscopy has been employed to study the dynamics of the internal stretch vibration of CO adsorbed on a Si(100) surface. Using the IR pump-sum-frequency generation probe method, the vibrational lifetime of the C-O stretch vibration has been determined to be 2.3+/-0.5 ns. Within the experimental error limits, the identical lifetime was observed for ¹²C¹⁶O and ¹³C¹⁶O. No strong dependency on the carrier density in the substrate, inferred from measurements using differently doped crystals, was observed.
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