Total cross sections for electron scattering from noble-gas atoms in near- and below-thermal energy collisions
Total cross sections for electron scattering from noble-gas atoms in near- and below-thermal energy collisions
复制标题
近热能和低温能碰撞中惰性气体原子电子散射的总截面
DOI：
10.1088/1742-6596/635/1/012030
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M Hoshino and H Tanaka
中科院分区：
文献类型：
--
作者：
M Kitajima;K Shigemura;K Hosaka;T Odagiri;M Hoshino and H Tanaka
给出了在极低电子能量下He、Ne、Ar、Kr和Xe电子散射的绝对总截面。利用阈值光电子源，结合穿透场技术和同步辐射原子的阈值光致电离，得到了原子的截面。所获得的电子与这些惰性气体原子的总散射截面与以前在100 meV以上的实验结果基本一致，这些实验工作已经报道了一些实验工作。氦的测量截面与理论截面的比较表明，在很低的能量下，甚至在10 meV以下，理论截面与理论截面符合得很好，这证实了理论截面的正确性，并将其作为标准截面。用修正的有效射程理论(MERT)测量了e-惰性气体的散射长度，结果表明，He和Ne的散射长度与以前的实验和理论研究结果符合得很好。另一方面，在惰性气体原子较重的情况下，由Mert分析得出的对我们总截面的散射长度与以前的研究报告的散射长度之间存在着显著的差异。
Absolute total cross sections for electron scattering from He, Ne, Ar, Kr and Xe at very low electron energies are presented. The cross sections were obtained using the threshold-photoelectron source, which employs a combination of the penetrating field technique together with the threshold photoionization of atoms by synchrotron radiation. Obtained total cross sections for electron scattering from these noble gas atoms generally agree well with those obtained in the previous experiments above 100 meV, where several experimental works have been reported. Comparison of the measured cross section for He with that of theoretical ones shows very good agreement at very low energies even below 10 meV, which confirms the validity of theoretical cross sections of He which have been regarded as the'standard'cross sections. Scattering lengths for the e--noble gas scatterings determined from the our cross sections using the modified effective range theory (MERT) showed that scattering lengths for He and Ne agree well with the values obtained in the previous experimental and theoretical studies. On the other hand, in case of heavier noble gas atoms, significant discrepancies were found between the scattering lengths derived from MERT analysis to our total cross sections and those reported in previous studies.