ELASTIC ELECTRON-SCATTERING AND VIBRATIONAL-EXCITATION OF CO2 IN THE THRESHOLD ENERGY REGION
ELASTIC ELECTRON-SCATTERING AND VIBRATIONAL-EXCITATION OF CO2 IN THE THRESHOLD ENERGY REGION
复制标题
DOI：
10.1088/0022-3700/18/22/014
复制
发表时间：
1985-01-01
影响因子：
1.6
通讯作者：
EHRHARDT, H
中科院分区：
文献类型：
--
作者：
KOCHEM, KH;SOHN, W;EHRHARDT, H
在交叉梁实验中，研究了e-+ CO 2在2 Pi u型共振下的弹性散射和三种基本振动模式的激发。在碰撞能量低于1.05 eV的绝对单位下，确定了微分截面的角和能量依赖性。对于弹性散射，截面向零能量方向的大幅度增加与虚态的存在是一致的。1 eV以下弹性微分截面的角依赖性表明，即使在非常低的碰撞能量下，直接散射也是重要的。1 eV以下两种红外主动模式（010）和（001）的激发主要由偶极子电位直接激发决定，而对称拉伸模式（100）的激发主要由s波散射决定。与最近的理论研究的比较表明，这种模式的角和能量依赖于阈值附近强烈地影响了e-+ CO 2势的虚态。
In a crossed-beam experiment e-+ CO 2 elastic scattering and the excitation of the three fundamental vibrational modes have been investigated in the energy region below the 2 Pi u shape resonance. Angular and energy dependences of the differential cross sections have been determined in absolute units below 1.05 eV collision energy. For elastic scattering the large increase of the cross section towards zero energy is consistent with the existence of a virtual state. The angular dependences of the elastic differential cross sections below 1 eV indicate that direct scattering is important even at very low collision energies. The excitation of the two infrared-active modes (010) and (001) below 1 eV is mainly determined by the direct excitation via the dipole potential, whereas the excitation of the symmetric-stretch mode (100) is dominated by s-wave scattering. A comparison with recent theoretical investigations shows that angular and energy dependences for this mode near threshold are strongly influenced by the virtual state of the e-+ CO 2 potential.