We have combined a Stark decelerator with a molecular beam-surface scattering setup to accurately measure the absolute electron emission yield, γ, of CO (a(3)Π) quenching at a Au(111) surface with quantum state resolution. We clearly observe an enhanced probability of electron emission when scattering vibrationally excited states of CO from the surface.
Grätz, F., Engelhart, D. P., Wagner, R. J. V., Haak, H., Meijer, G., Wodtke, A. M., & Schäfer, T. (2013). Vibrational enhancement of electron emission in CO (a3Π) quenching at a clean metal surface. Physical Chemistry Chemical Physics, 15(36), 14951–14955. https://doi.org/10.1039/c3cp52468j