Abstract
Electron energy loss spectra recorded at 135° atconstant scattered electron energies of 0.05, 0.6 and 3.0 eV, and with 10 meV resolution, reveal that the antisymmetricstretch vibration (001) is excited much less than the symmetricstretch vibration (100). Spectra subtraction indicates that the(001) level is excited about 5× less than (100) at 1 eV.Band profiles recorded 0.6 eV above threshold show that theΔJ = 0 branch dominates the excitation of (010) and (100)vibrations but is absent for the (001) vibration. Thisindicates that resonant excitation is decisive for the (010)and (100) states but direct dipole mechanism for (001). TheR-matrix adiabatic nuclei theory with closure approximationreproduces well the cross section for the (010) state, butdramatically underestimates the cross section for the symmetricstretch vibration and overestimates the cross section for the asymmetric stretch vibration.
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