An atomic oxygen target for absolute differential cross section measurements

An atomic oxygen target suitable for absolute differential cross sections has been developed. Molecular oxygen gas is partially dissociated in a microwave discharge and flowed through a collision cell to serve as a fast beam target. Determination of the atomic oxygen density is carried out using an electron impact time-of-flight mass spectrometer, which uses the exit aperture of the cell as a sample leak

The absolute differential cross-section for charge transfer scattering of 1.5 keV protons with atomic oxygen

The absolute cross section, differential in laboratory scattering angle, for the process \rm H\sp{+} + O\to H + O\sp{+} using 1.5 keV-energy protons is reported. The total cross section value of (8.7 $\pm$ 1.9) $\times$ 10\sp{-16} cm\sp2 derived from the integration of the differential cross section is compared with existing cross section data