Study on quenching reactions of metastable O-2( b(1)Sigma(+)(g))

Metastable O-2 in the b(1)Sigma (+)(g) state has been prepared in a flowing after - glow reactor by oxygen atoms recombination on a nickel surface at 300 K. By using the pseudo - first - order method, total quenching rate con stants for 15 molecules are measured to be in the range of 10(-12) similar to 10(-14) cm(3) molecule(-1).s(-1), with those for metastable O-2( b(1) Si gma (+)(g)) reactions with CH2Cl2, CHCl3, CH3CN, C2H4Cl2, C2H2Cl4, C3H7NH2, (C2H5)(2)NH and C6H6 being known for the first time. An electronic - to - vibrational (E - V) energy transfer model analysis shows that O-2(b(1) Sigm a (+)(g)) quenching reaction rate constant is closely correlated with termi nal bond number of X-H (X = C, N, O) bond within a quenching reagent molecu le. Our experimental measurement also demonstrates that a completely theore tical description of O-2( b(1) Sigma (+)(g)) quenching reaction mechanism n eeds to further consider other characteristics of reagent molecules.