论文部分内容阅读
研究了C2(a3Пu)自由基与NO,N2O,O2,H2,NH3等分子的反应动力学.C2(a3Пu)自由基是由266 nm光解C2Cl4产生的,用激光诱导荧光(LIF)检测C2(a3Пu)自由基的相对浓度随着反应时间的变化,得到C2(a3Пu)自由基与N2O,NH3的双分子速率常数:kN2O=(1.63±0.20)×10-13cm3·mol-1·S-1,kNH3=(5.92±1.00)×10-14cm3·mol-1·S-1.C2(a3Пu)自由基与NO,O2,H2等分子反应的消耗速率常数:kNO=(5.46±0.10)×10-11cm3·mol-1·s-1, kO2=(1.58±0.16)×10-11cm3·mol-1·s-1,kH2<1.0×10-4cm3·mol-1·S-1对反应分析及理论计算的结果表明:C2(a3Пu)自由基与NH3和H2反应主要是抽氢过程,且反应的入口通道都存在一个能垒.
The reaction kinetics of C2 (a3Пu) radicals with NO, N2O, O2, H2, NH3 and other molecules were studied.The free radical C2 (a3Пu) was produced by 266 nm photodissociation of C2Cl4 and detected by laser induced fluorescence (LIF) (a3Пu) radical with the change of reaction time, we get the bimolecular rate constant of C2 (a3Пu) radical and N2O, NH3: kN2O = (1.63 ± 0.20) × 10-13cm3 · mol-1 · S- 1, kNH3 = (5.92 ± 1.00) × 10-14cm3 · mol-1 · S-1.C2 (a3Пu) free radicals and NO, O2, H2 and other molecular reaction rate constants: kNO = (5.46 ± 0.10) × 10-11cm3 · mol-1 · s-1, kO2 = (1.58 ± 0.16) × 10-11cm3 · mol-1 · s-1 and kH2 <1.0 × 10-4cm3 · mol- Theoretical calculations show that the reaction of C2 (a3Пu) with NH3 and H2 is mainly hydrogen-evolving, and there is an energy barrier in the reaction channel.