Proton ejection from molecular hydride clusters exposed to strong x-ray pulses.
Proton ejection from molecular hydride clusters exposed to strong x-ray pulses.
复制标题
暴露于强 X 射线脉冲下的氢化物簇中的质子喷射。
DOI：
10.1103/physrevlett.111.123401
复制
发表时间：
2013
影响因子：
8.6
通讯作者：
J. Rost
中科院分区：
文献类型：
--
作者：
P. Di Cintio;U. Saalmann;J. Rost
由含氢小分子组成的簇在短 X 射线脉冲照射时确实会喷射出快速质子。由 X 射线强度控制的团簇的适当整体充电诱导电子从表面迁移到本体，从而导致质子的有效分离以及即使在屏蔽体积之外的重原子的全局受阻爆炸。我们沿着甲烷相对于氨和水的等电子序列，以氖原子极限作为参考，系统地研究了这种奇特的效应。与牺牲外壳以减少辐射损伤的核壳系统相比，氢化物簇复杂的质子动力学允许人们保持重原子的整个主链完好无损。
Clusters consisting of small molecules containing hydrogen do eject fast protons when illuminated by short x-ray pulses. A suitable overall charging of the cluster controlled by the x-ray intensity induces electron migration from the surface to the bulk leading to efficient segregation of the protons and to a globally hindered explosion of the heavy atoms even outside the screened volume. We investigate this peculiar effect systematically along the isoelectronic sequence of methane over ammonia and water to the atomic limit of neon as a reference. In contrast to core-shell systems where the outer shell is sacrificed to reduce radiation damage, the intricate proton dynamics of hydride clusters allows one to keep the entire backbone of heavy atoms intact.