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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Cross Sections and Asymmetry Parameters for Formic Acid in the Vacuum-Ultraviolet Energy Range
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Cross Sections and Asymmetry Parameters for Formic Acid in the Vacuum-Ultraviolet Energy Range

机译：真空 - 紫外能量范围内甲酸的横截面和不对称参数

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摘要

We present an experimental and theoretical investigation of the photon interaction with formic acid in the vacuum-ultraviolet energy range. The absolute absorption cross sections and ionization efficiencies were measured in the 11.2-21.4 and 13.5-21.4 eV ranges, respectively, using a double-ion chamber technique. Photoionization and neutral-decay cross sections were derived from these results. From the present ionization cross sections and previously reported ionic dissociative branching ratios, the partial cross sections for dissociating processes were obtained. Theoretically, the photoionization cross sections and the asymmetry parameters of the photoelectron angular distributions for ionization out of the six outermost valence orbitals (10a', 2a '', 9a', 1a '', 8a', and 7a') were obtained in the energy range from near-threshold to 35 eV. For that, the Pade approximant technique along with the single-center partial-wave expansion method was applied to solve the Lippmann-Schwinger equation in the static-exchange-polarization level of approximation. This is the first theoretical investigation concerning the determination of the asymmetry parameters and photoionization cross sections of formic acid in the vacuum-ultraviolet energy range. Comparison is made between our results and the previous ones.
机译：我们在真空 - 紫外能量范围内提出了对甲酸光子相互作用的实验和理论研究。使用双离子室技术，在11.2-21.4和13.5-21.4eV中测量绝对吸收横截面和电离效率。从这些结果衍生光相和中性衰减横截面。从本发明的电离横截面和先前报道的离子分离支化比，得到用于解离工艺的部分横截面。从理论上讲，在获得了光电离截面和用于离子化出来的六个最外价轨道光电子角分布的非对称性参数（10A“ 2A'，9A”，1A‘’，8A“和7a”）能量范围从近阈值到35 ev。为此，应用梯度近似技术以及单中心部分波扩展方法来解决静态交换偏振水平的Lippmann-Schwinger方程。这是关于在真空 - 紫外能量范围内测定甲酸的不对称参数和光离移截面的第一个理论研究。在我们的结果和之前的比较之间进行了比较。

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