Abstract
Vibrational excitation of CO 2 molecules of the ground electronic state by 203 eV Li + incident was measured with an ion energy-loss spectrometer at nearly 0°. The energy resolution (F.W.H.M.) of the spectrometer was 14 meV. The attention was mainly directed to the excitation of overtones of bending mode, n ν 2 . Only the peaks corresponding to the excitation of (02 2 0) and (03 3 0) levels were observed for 2ν 2 l and 3ν 2 l , respectively. The excitation cross section of the state (03 3 0) was estimated to be about 2×10 -18 cm 2 at E I =203 eV. The excitation of 3ν 2 was explained by a third order perturbation through a three step process (00 0 0)→(01 1 0)→(02 2 0)→(03 3 0) where each step is caused by a perturbation of charge-dipole force linearly depending on the vibrational coordinate of the molecule.
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