Abstract
In the inelastic scattering of nearly monoenergetic proton beams (≅ 20 e V) from polyatomic molecules
such as CF4 sharp peaks are observed corresponding to the excitation of very high overtone levels
(n ≤ 14) of the infrared active modes. The collision mechanism leading to the high degree of excitation is
described and an example from recent experiments is presented. A fit of the CF4 spectra provides new
anharmonicity constants for the