Ran, Q., Matsiev, D., Auerbach, D. J., & Wodtke, A. M. (2007). Observation of a change of vibrational excitation mechanism with surface temperature: HCl collisions with Au(111). Physical Review Letters, 98(23): 237601. Retrieved from http://prl.aps.org/pdf/PRL/v98/i23/e237601.