Interactions of Vibrationally Excited Molecules with Solid Surfaces.
CORNELL UNIV ITHACA NY
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The interaction of gas-phase molecules with solid surfaces is of importance to heterogeneous catalysis, corrosion, air filtration, pollution control, and chemical deactivation. Our research group has recently obtained some of the first direct measurements of the probability for vibrational deactivation during gas-solid collisions. A pulsed infrared laser is used to excite CO of CO2 vibrationally under conditions where the predominant cause of deactivation is due to the gas-surface collision. The probability of relaxation is then monitored by observing the time-dependent decay of infrared fluorescence from the excited molecules. Results for CO2 001 show that the deactivation probability is 0.22 for collisions with a stainless steel surface, 0.16 for silver, and 0.20 for nickel.
- Atomic and Molecular Physics and Spectroscopy