Differential cross sections for electron impact vibrational excitation of molecular oxygen in the angular range 15°–180°

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Absolute differential cross sections have been measured for excitation of the v = 1–4 vibrational levels of the X3Σg− ground state of molecular oxygen at an electron impact energy of 10 eV in a wide scattering angle range, from 15° to 180°. In the measurements, a recently constructed double hemispherical electron spectrometer has been used which employs the magnetic angle-changing technique to observe the backward scattering of electrons. The integral excitation cross sections for the above vibrational levels have been also determined through integration of the measured differential cross sections. A detailed comparison of the obtained cross sections has been made with the results of previous measurements.