UV Absorption Spectrum of the ClO Dimer (Cl<sub>2</sub>O<sub>2</sub>) between 200 and 420 nm
作者:Dimitrios K. Papanastasiou、Vassileios C. Papadimitriou、David W. Fahey、James B. Burkholder
DOI:10.1021/jp9065345
日期:2009.12.10
subsequently Cl2O2 via the termolecular ClO self-reaction. The Cl2O2 spectrum was obtained from spectra recorded following the completion of the gas-phase ClO radical chemistry. The spectral analysis used observed isosbestic points at 271, 312.9, and 408.5 nm combined with reaction stoichiometry and chlorine mass balance to determine the Cl2O2 spectrum. The Cl2O2 UV absorption spectrum peaks at 244.5 nm with
Cl 2 O 2(过氧化二氯)的紫外线光解是催化破坏平流层臭氧的关键步骤。在这项研究中,使用二极管阵列光谱法测量了Cl 2 O 2的气相紫外吸收光谱,并报道了在200-420 nm波长范围内的绝对截面σ。在低温(200-228 K)和高压(〜700 Torr,He)下于248 nm的Cl 2 O或351 nm的Cl 2 / Cl 2 O混合物的脉冲激光光解可产生ClO自由基,随后产生Cl 2 O 2通过分子间的ClO自反应。Cl 2 O 2从气相ClO自由基化学反应完成后记录的光谱中获得光谱。光谱分析使用在271、312.9和408.5 nm处观察到的等渗点,结合反应化学计量和氯气质量平衡来确定Cl 2 O 2光谱。Cl 2 O 2的UV吸收光谱在244.5nm处具有7.6 -0.5 + 0.8 ×10 -18 cm 2分子-1的横截面的峰值,其中所引用的误差极限为2σ,并且包括估计的系统误差。Cl