We characterize the 157 nm photodissociation of dichloromethane (CH₂Cl₂) using photofragment translational spectroscopy, detecting the products with photoionization mass spectrometry. The major photodissociation products are Cl + CH₂Cl and HCl + CHCl. Comparing the integrated ion signal at m/e=35 (Cl⁺) and m/e=49 (CH₂Cl⁺) gives the partial photoionization cross section of CH₂Cl to parent ion to be σ=26.6 Mb at 13.7 eV. This value is a quantitative anchor point of the energy-dependent photoionization cross section. In recent work we used this result to quantify the product branching to HCO + CH₂Cl in the photodissociation of 2-chloroacetaldehyde.

中文翻译：

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用二氯甲烷的光碎平移光谱法测量CH ₂ Cl的光电离截面

我们表征了157 nm的二氯甲烷（CH ₂ Cl ₂）的光解离平移光谱，用光电离质谱法检测产物。主要的光解离产物是Cl + CH ₂ Cl和HCl + CHCl。比较在m / e = 35（Cl ⁺）和m / e = 49（CH ₂ Cl ⁺）处的积分离子信号，得出在13.7 eV处，CH ₂ Cl与母离子的部分光电离截面为σ= 26.6 Mb。该值是取决于能量的光电离截面的定量锚定点。在最近的工作中，我们使用此结果来量化产物分支为HCO + CH₂ Cl在2-氯乙醛的光解离中。