Kinetic Study of the Reactions of Gas Phase Pd(a~1S_0), Ag(5s ~2S_(1/2)), Au(6s ~2S_(1/2)), Cd(5s~2 ~1S_0), and Hg(6s~2 ~1S_0) Atoms with Nitrous Oxide

摘要

The reactivity of gas-phase Pd(a~1S_0), Ag(5s ~2S_(1/2)), Au(6s ~2S_(1/2)), Cd(5s~2 ~1S_0), and Hg(6s~2 ~1S_0) with N_2O as a function of temperature and pressure is reported. The reported. The transition metal atoms were produced by the photodissociation of an appropriate precursor molecule and detected by laser-induced fluorescence. The reaction of palladium with N_2O is pressure dependent indicating adduct formation. The room-temperature limiting low-pressure third-order rate constant is (2.5±0.8) * 10~(-30) molecule~(-2) cm~6 s~(-1) in argon buffer. The limiting low-pressure third-order rate constant can be expressed as log k_0(T) = -219.06 + 152(log T) - 30.5(log T)~2 molecule~(-2) cm~6 s~(-1) over the temperature range 294-523 K. The reactions of ground-state silver, gold, cadmium, and mercury with N_2O are very slow, and only upper limits for the rate constants can be reported for these reactions.