论文标题
后坐力离子动量光谱仪的设计和表征，用于研究MEV能量离子电离电离的分子碎片动力学
Design and characterization of a recoil ion momentum spectrometer for investigating molecular fragmentation dynamics upon MeV energy ion impact ionization
论文作者
论文摘要
我们介绍了新建造的后坐力离子动量光谱仪的发展和性能，以研究电离分子的碎片化动力学。光谱仪基于两个阶段的Wiley-Mclaren几何形状，并满足时间和速度聚焦条件。在漂移区域中引入了静电镜，以实现速度成像和较高的角度收集。光谱仪配备了带有多幅度巧合电子的2D位置敏感探测器。可以通过4π收集检测具有动能的离子片段〜8 eV。光谱仪的总体性能已通过对1 MEV质子的影响，通过对双原子（n $ _2 $）和多原子（ch $ _2 $ cl $ _2 $）分子进行三维离子成像测量测量。三维动量和动能释放分布源自测量的位置和飞行时间光谱。观察到的各种破碎通道以及测得的动能释放分布的特征与可用数据完全一致。
We present the development and performance of a newly built recoil ion momentum spectrometer to study the fragmentation dynamics of ionized molecules. The spectrometer is based on the two-stage Wiley-McLaren geometry and satisfies both time and velocity focusing conditions. An electrostatic lens has been introduced in the drift region to achieve velocity imaging and higher angular collection. The spectrometer is equipped with a 2D position-sensitive detector with multi-hit coincidence electronics. Ionic fragments with kinetic energy ~ 8 eV can be detected with 4π collection. The overall performance of the spectrometer has been tested by carrying out three-dimensional ion imaging measurements for diatomic (N$_2$) and polyatomic (CH$_2$Cl$_2$) molecules under the impact of 1 MeV proton. Three-dimensional momentum and kinetic energy release distributions were derived from the measured position and time-of-flight spectra. The observed features of the various fragmentation channels as well as the measured kinetic energy release distributions are in complete agreement with the available data.
