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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Speed-Dependent Alignment and Angular Distributions of O(~1D_2)from the Ultraviolet Photodissociation of N_2O
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Speed-Dependent Alignment and Angular Distributions of O(~1D_2)from the Ultraviolet Photodissociation of N_2O

机译：N_2O紫外光解离对O（〜1D_2）的速度依赖性对准和角分布

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摘要

Photofragment ion imaging has been used to study the O~(1D_2) atoms produced in the ultraviolet (approx 200 nm) photodissociation of nitrous oxide (N_2O) in a molecular beam. The images of O(~1D_2) reveal a speed-dependent angular distribution resulting from both variation in the spatial anisotropy of the recoil and alignment of the electronic angular momentum of the O(~1D_2) fragment. The orbital alignment effects are revealed by a change in the images when different transitions of the O atom are employed in the resonance enhanced multiphoton ionization (REMPI) process. By correlating the O atom anisotropies with previously measured values for the complementary N_2 fragments and comparing images collected on two different REMPI transitions, we calculate the relative branching ratios and anisotropies for the three different |m| values (defined along the product recoil axis) of the electronic angular momentum of the O(~1D_2) fragment. While m = 0 fragments have the highest probability for most O atom speeds, there is a significant change in the alignment and angular distributions for the slower O atoms. We use a simplified dynamical model supported by previous theoretical structure calculations to explain the measured trends and to estimate the relative branching in the excitation to two N_2O electronic states.
机译：光碎片离子成像已用于研究分子束中一氧化二氮（N_2O）在紫外线（约200 nm）的紫外光解中产生的O〜（1D_2）原子。 O（〜1D_2）的图像显示出反冲力的空间各向异性变化和O（〜1D_2）碎片的电子角动量对齐导致的速度相关角分布。当在共振增强的多光子电离（REMPI）过程中使用O原子的不同跃迁时，图像的变化会显示出轨道对准效应。通过将O原子的各向异性与互补N_2片段的先前测量值相关联，并比较在两个不同REMPI跃迁上收集的图像，我们计算了三个不同| m |的相对支化比和各向异性。 O（〜1D_2）碎片的电子角动量的值（沿产品后坐力轴定义）。虽然m = 0的碎片在大多数O原子速度下具有最高的概率，但对于速度较慢的O原子，排列和角度分布会发生重大变化。我们使用先前理论结构计算支持的简化动力学模型来解释测得的趋势，并估计激发到两个N_2O电子态的相对分支。

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