Fast-electron impact ionization of molecular hydrogen: energy and angular distribution of double and single differential cross sections and Young-type interference
Fast-electron impact ionization of molecular hydrogen: energy and angular distribution of double and single differential cross sections and Young-type interference
复制标题
氢分子的快速电子碰撞电离：双微分截面和单微分截面的能量和角分布以及杨氏干涉
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
L. Tribedi
中科院分区：
文献类型：
--
作者：
S. Chatterjee;S. Kasthurirangan;A. Kelkar;C. Stia;O. Fojón;R. Rivarola;L. Tribedi
本文报道了8 keV入射电子与氢分子碰撞过程中电子的绝对双微分截面（DDCS）的能量和角分布。探测到能量在1 eV ~ 400 eV之间、出射角在30° ~ 150°之间的出射电子。将实测数据与基于双有效中心（TEC）模型的理论计算结果进行了比较。一阶干涉来自DDCS的能量分布和由此产生的比谱（H2至2 H）表现出振荡行为。一阶干涉的签名也证明在DDCS光谱作为喷射角的函数。我们已经表明，建设性的干涉普遍存在于软和二进制碰撞区域。通过积分DDCS的立体角以及喷射能量的单微分截面（SDCS）推导。我们证明了SDCS和相应的比率谱也保留了干扰的签名。
We report the energy and angular distribution of absolute double differential cross sections (DDCSs) of ejected electrons in collisions of 8 keV projectile electrons with molecular hydrogen. The ejected electrons with energy between 1 eV and 400 eV and ejection angles between 30° and 150° are detected. The measured data are compared with the theoretical calculations based on two-effective centre (TEC) model. The first-order interference is derived from the energy distribution of DDCS and the resulting ratio spectra (H2 to 2H) exhibit oscillating behaviour. The signature of first-order interference is also demonstrated in the DDCS spectra as a function of the ejection angle. We have shown that the constructive interference prevails in soft- and binary-collision regions. The single differential cross sections (SDCS) are deduced by integrating the DDCS over the solid angle as well as ejection energy. We demonstrate that the SDCS and corresponding ratio spectra also preserve the signature of interference.