【摘要】 利用H2 O在 1 85nm紫外光照射下产生定量OH自由基 ,用低压扩散激光诱导荧光技术建立了OH自由基标定系统 .在实验条件下 ,体系产生OH自由基的浓度范围为 3× 1 0 7— 2× 1 0 9个·cm- 3,得到归一化荧光信号 (S)与OH自由基浓度的定量关系为S =6 0 4× 1 0 - 9[OH]- 0 0 4 0 7(R2 =0 987) ,并研究和讨论了饱和效应以及体系中可能存在的干扰 .更多还原

【Abstract】 The absolute calibration system of OH radical has been established under the laboratory conditions using fluorescence assay by gas expansion (FAGE) technique.It is based on the photolysis of H\-2O radiated by 185?nm UV light produced by low\|pressure Hg lamp.The relationship between the normalized fluorescence signal ( S ) and the OH concentration (\) is: S =6.04×10 -9 \-0 0407( R 2=0 987).And the detection limitation was about 4 7×10 7 OH·cm -3 .The possible interferences and saturation effect were discussed.更多还原