Abstract
Excitation of molecular oxygen by electron impact has been observed at the backward scattering angle of 180°. For these studies a new solenoid system with a conical geometry has been designed to implement the angle-changing technique. Energy loss spectra have been measured to deduce differential cross-sections for vibrational excitation of the X 3Σ g − ground state and excitation of the a 1Δ g state at 180°. Excitation of the b 1Σ g + state has not been observed at 180° in agreement with the theoretically predicted selection rule Σ −←↦Σ + at that angle.
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