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首页> 外文期刊>The Journal of Chemical Physics >LOW ENERGY ELECTRON SCATTERING FROM CH3CL
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LOW ENERGY ELECTRON SCATTERING FROM CH3CL

机译：CH3CL的低能电子散射

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Differential cross section measurements for the elastic scattering of electrons from CH3Cl at energies from 0.5 to 9.5 eV are reported for scattering angles of 30 degrees and 100 degrees. The angular scattering dependence is determined at selected energies over this range. At energies below 1.0 eV, the cross sections are in excellent agreement with calculations using the Born dipole approximation. At large angles and higher energies, the scattering is dominated by a (2)A(1) temporary negative ion state near 3.5 eV. Energy loss data at 3.5, 5.0, and 8.5 eV are reported and the relative contributions of various vibrational modes determined. Differential cross sections for vibrational excitation of the nu(3)(alpha(1))(C-Cl) and nu(4)(e)(CH) stretching modes have been measured. The latter reveals a broad shape resonance of (2)E symmetry peaking near 5.5 eV. Angular distributions for excitation of these same modes are also reported. Using fittings to the vibrational excitation functions, the resonance parameters have been extracted and used in a mixed semiempirical ab initio calculation to compute the relative strengths of the vibrational energy loss peaks. These compare favorably with the results of the experiment. Elastic cross sections integrated over angle are reported for low energies. They are substantially larger than the results from recent measurements of the total cross section (C) 1996 American Institute of Physics. [References: 34]
机译：据报道，对于散射角为30度和100度的情况，在0.5至9.5 eV的能量下，来自CH3Cl的电子发生弹性散射的微分截面测量结果。在此范围内的选定能量下确定角度散射依赖性。在能量低于1.0 eV时，横截面与使用Born偶极子近似的计算非常吻合。在大角度和更高的能量下，散射主要由3.5 eV附近的（2）A（1）临时负离子状态决定。报告了3.5、5.0和8.5 eV的能量损失数据，并确定了各种振动模式的相对贡献。已测量了nu（3）（alpha（1））（C-Cl）和nu（4）（e）（CH）拉伸模式的振动激发的差分截面。后者揭示了（2）E对称性在5.5 eV附近达到峰值的宽形状共振。还报告了激发这些相同模式的角分布。通过使用振动激励函数的拟合，已经提取了共振参数，并将其用于混合半经验从头算中，以计算振动能量损失峰值的相对强度。这些与实验结果相比具有优势。据报道，在低角度下，在整个角度上集成了弹性横截面。它们远大于最近对1996年美国物理研究所的总横截面（C）的测量结果。 [参考：34]

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