Ž 3 . Experiments are performed in which vibrationally and electronically excited CO a P, Õs1 molecules are scattered Ž . from a LiF 100 surface. As there is originally no population in the vibrationless level of the metastable state, this experiment gives the unique possibility of probing the vibrationally inelastic channel in the scattering of vibrationally excited molecules. The vibrational ...