A KINETIC-STUDY ABOUT THE REACTIONS OF NH(X(3)SIGMA(-)) WITH HYDROCARBONS .3. BENZENE, 1,3-BUTADIENE AND ACETYLENE

The reactions of NH in its electronic ground state with benzene (1), 1 ,3-butadiene (2) and acetylene (3) were investigated behind incident s hock waves using narrow line width absorption detection of NH(X(3) Sig ma(-)). The experiments were performed with very low initial concentra tions of HN3 which was used as NH(X(3) Sigma(-)) source to reduce the influence of secondary reactions. Thus it became possible to measure k inetic data for the reactions of NH(X(3) Sigma(-)) with these hydrocar bons directly. The following rate constants were obtained in the tempe rature range 1100 to 1500 K, resp. 1400 to 1700 K (acetylene): k(1) = 10((14.2+/-0.3)) exp (-(76+/- 8) kJ mol(-1)/RT) cm(3)/mol s k(2) = 10( (13.9+/-0.3)) exp (-(45 +/-7) kJ mol(-1)/RT) cm(3)/mol s k(3) = 10((14 .7+/-0.3)) exp (-(59+/- 9) kJ mol(-1)/RT) cm(3)/mol s.