Penning ionization of atomic oxygen by helium (2¹S, 2³S) metastable atoms
Cook, Thomas Bratton
Stebbings, Ronald F.
Master of Arts
Penning ionization of atomic oxygen is one of the important deexcitation processes for helium triplet metastable atoms in the atmosphere. Measurements of absolute Penning ionization cross sections for the reactions He(21S, 23S) + (3P) -> + + He + e are reported. Calculations of the atmospheric He(23S) concentration are discussed and the results of one such calculation, as recently reported in the literature, are presented.