Kinetic investigation of the reactions of OH(X<sup>2</sup>Π) with the hydrogen halides, HCl, DCl, HBr and DBr by time-resolved resonance fluorescence (A<sup>2</sup>∑<sup>+</sup>–X<sup>2</sup>Π)
作者:David Husain、John M. C. Plane、Nigel K. H. Slater
DOI:10.1039/f29817701949
日期:——
The reaction rates of ground-state OH radicals, X2Π(v″= 0), with the molecules CH4, CO, HCl, DCl, HBr and DBr have been investigated in the gas phase by time-resolved resonance fluorescence at λ= 307 nm [OH(A2∑+–X2Π, (0, 0)]. The OH radicals were generated photochemically by the repetitive vacuum ultraviolet photolysis of water vapour in a flow system, kinetically equivalent to a static system, using
基态OH自由基,所述的反应速率X 2 Π(v “= 0),与分子CH 4,CO,盐酸,DCl的,HBr和DBR已在气相中通过在λ时间分辨共振荧光研究= 307纳米[OH(阿2 Σ + - X 2 Π,(0,0)]。进行光化学通过水蒸气在流动系统中的重复真空紫外线光解,在动力学上等效于一个静态系统产生的OH自由基,使用一个高强度的,被磁性夹住的脉冲光源,并被光激发到A 2 ∑ +通过在标准正交布置中运行的谐振源来实现状态。通过使用预触发光电倍增器选通,光子计数和信号平均的高度灵敏的检测系统,监测得到的时间分辨共振荧光信号。对于OH与上述分子的反应,获得了绝对的二级速率常数(k / cm 3分子–1 s –1,300 K)如下:CH 4(7.66±0.64)×10 –15 CO(1.46± 0.12)×10 –13,HCl(6.66±0.52)×10 –13,DCl(3.48±0.30)×10