Kinetics of the reactions Br + NO 2 + M and I + NO 2 + M

The reactions Br + NO 2 + M → BrNO 2 + M (1) and I + NO 2 + M → INO 2 + M (2) have been studied at low pressure (0.6‐2.2 torr) at room temperature and with helium as the third body by the discharge‐flow technique with EPR and mass spectrometric analysis of the species. The following third order rate constants were found k 1(0) = (3.7 ± 0.7) × 10 −31 and k 2(0) = (0.95 ± 0.35) × 10 −31 (units are cm 6 molecule −2 s −1 ). The secondary reactions X + X NO 2 → X 2 + NO 2 ( X = Br, I) have been studied by mass spectrometry and their rate constants have been estimated from product analysis and computer modeling.