Metastable O~2 in the b^1∑^+~g state has been prepared in aflowing after -glow reactor by oxygen atoms reacombination on a nikel surface at 300K. By using the pesudo -first -order method, total quenching tate constanbts for 15 molecules are measured to be the range of 10^- 12～10^-14cm^3·molecule^-1·s^-1,with those for metastable O~2(b^1∑ ^+~g) reactions with CH~2Cl~2, CHCl~3, CH~3CN, C~2H~4Cl~2,C~2H~2Cl~4 C~3H~7NH~2,(C~2H~5)~2NH and C~6H~6 being known for the first time. An electronic ----to ---vibrational (E--V) energy transfer model analysis shows that O~2(b^1∑^+~g) quenching reaction rate constant is clorrelated with terminal bond number of x----h(x=c, n, o) bond within a quenching reagent molecule. Iur experimental measurement also demonstrates that a completely theoretical description of O~2 (b^1∑^+~g) quenching reaction mechanism needs to further consider other characteristics of reagent molecules.

Key words: METASTABLE STATES, OXYGEN, REACTION RATE CONSTANT