水分子与正离子碰撞的负离子发射：二元和多体过程的识别
Anion emission from water molecules colliding with positive ions: Identification of binary and many-body processes
摘要：
结果表明，负离子从气相水分子轰击时，在keV的能量典型的太阳风的速度与正离子。这一发现与行星和彗星大气的研究以及辐解和放射生物学有关。在6.6 keV 16 O + + H2O碰撞中观察到H-和较重的（O-和OH-）阴离子的发射，其中H-的产率较大。实验设置允许单独识别的阴离子碰撞中形成的多体动力学从那些在硬，二元碰撞。大多数阴离子由于多体过程而以低动能发射。模型计算表明，核-核相互作用和电子激发是导致大的负离子发射产额的主要原因.
英文摘要：
It is shown that negative ions are ejected from gas-phase water molecules when bombarded with positive ions at keV energies typical of solar-wind velocities. This finding is relevant for studies of planetary and cometary atmospheres, as well as for radiolysis and radiobiology. Emission of both H- and heavier (O- and OH-) anions, with a larger yield for H-, was observed in 6.6-keV 16O+ + H2O collisions. The ex-perimental setup allowed separate identification of anions formed in collisions with many-body dynamics from those created in hard, binary collisions. Most of the ani-ons are emitted with low kinetic energy due to many-body processes. Model calcu-lations show that both nucleus-nucleus interactions and electronic excitations con-tribute to the observed large anion emission yield.
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