Projectile-charge sign dependence of four-particle dynamics in helium double ionization.
Projectile-charge sign dependence of four-particle dynamics in helium double ionization.
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DOI：
10.1103/physrevlett.90.243201
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发表时间：
2003-06
影响因子：
8.6
通讯作者：
D. Fischer;R. Moshammer;A. Dorn;José R. Crespo López-Urrutia;B. Feuerstein;C. Höhr;C. Schröter;S. Hagmann;H. Kollmus;R. Mann;B. Bapat;J. Ullrich
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文献类型：
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作者：
D. Fischer;R. Moshammer;A. Dorn;José R. Crespo López-Urrutia;B. Feuerstein;C. Höhr;C. Schröter;S. Hagmann;H. Kollmus;R. Mann;B. Bapat;J. Ullrich
使用“反应显微镜”在完整的运动学实验中探索了 6 MeV 质子撞击造成的氦双电离。首次获得了带正电射弹的全微分横截面，并与 2 keV 电子撞击的数据进行了比较。喷射电子的角分布中观察到的显着差异归因于弹丸的电荷符号，导致四粒子库仑系统的动力学不同，这是第一玻恩近似中未考虑的。
Double ionization of helium by 6 MeV proton impact has been explored in a kinematically complete experiment using a "reaction microscope." For the first time, fully differential cross sections for positively charged projectiles have been obtained and compared with data from 2 keV electron impact. The significant differences observed in the angular distribution of the ejected electrons are attributed to the charge sign of the projectile, resulting in different dynamics of the four-particle Coulomb system, which is not considered in the first Born approximation.