Using the discharge flow-mass spectrometric technique, the kinetics and mechanism of the BrO + HOa reaction have been investigated in the temperature range 233-344 K. With an excess of H02 over BrO, the rate constant was found to be kl = (4.77 f 0.32) x exp[(580 f 100) / r] cm3 molecule-' s-l. The reaction may proceed via two channels: BrO + H02 -HOBr + 0 2 (la) and BrO + HO2 -HBr + 0 3 (lb).Over the whole temperature range, HOBr was observed as the major product, whereas an upper limit was measured for channel l b from the absence of detection of 0 3 : kldkl .c 1.5%. The potential implications of these data are briefly discussed in relation to the stratospheric bromine/ozone interaction.

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The technique of identification of a paramagnetic component of the molecular beam in an inhomogeneous magnetic field is used for investigation of elementary chemical reactions. The focusing of a halogen atom beam as a function of the magnetic field strength is determined. A detailed mechanism of reaction F+CF3I→IF+CF3 is proposed. The dependence of the focusing of CF3 and CH3 radicals obtained in chemical reactions on the field strength is discussed.

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