35.+/-.0.2.Degree.C; dimerization reaction;

oxygen in gas Kinetics; temp. dependence of gas phase reaction investigated;

nitrogen(II) oxide in gaseous matrix Kinetics; byproducts: NO2; generation of HOSO2 in discharge flow apparatus (He buffer gas) from OHand SO2 (room temp., 1-6.4 Torr), addn. of O2 and NO to react. medium; monitored by ESR and mass spectrometry;

oxygen in gaseous matrix Kinetics; byproducts: HO2; gas phase react. at 298 K (flow reactor); detection of HOSO2 and SO3 by mass spectrometry;

oxygen in gas Kinetics; temp. dependence of gas phase reaction investigated;

nitrogen(II) oxide in gaseous matrix Kinetics; byproducts: NO2; generation of HOSO2 in discharge flow apparatus (He buffer gas) from OHand SO2 (room temp., 1-6.4 Torr), addn. of O2 and NO to react. medium; monitored by ESR and mass spectrometry;