慢速 Ar$^{q+}$-CO$_2$ 碰撞中弹体与目标激发的关联
Association between projectile and target excitation in slow Ar$^{q+}$-CO$_2$ collisions
AI总结：
研究慢速 Ar$^{q+}$-CO$_2^{n+}$ 碰撞中离子碎片化行为，发现弹体电荷变化对动能释放分布（KERD）形状有影响，且随着弹体电荷增加影响减弱，CO$_2^{3+}$ 分裂中出现两个异常趋势。
摘要：
我们研究了在 Ar$^{q+}$（4≤q≤16）弹体与 CO$_2^{n+}$（2≤n≤4）碰撞时产生的离子碎片化行为，碰撞速度约为 0.3 a.u.。对于大多数弹体和碎片化通道组合，动能释放分布（KERD）形状随弹体电荷变化（Δq）而变化：Δq=2 时高动能区域的 KERD 比 Δq=1 时更宽。这种差异通常随着弹体电荷增加而减弱。在 CO$_2^{3+}$ 分裂中观察到两个偏离一般趋势的异常，一个是在 Ar$^{4+}$ 作用下的高 KER 区域，另一个是在 Ar$^{6+}$ 作用下的低 KER 区域。基于扩展经典过障模型（ECOBM）计算的多电子捕获反应窗口表明，尽管目标离子化是通过多电子捕获实现的，但散射弹体可能随后经历多级自电离。将弹体自电离解释为捕获到高能态的结果，高碎片 KER 解释为离子化目标被激发到高能态的结果，发现目标与散射弹体激发之间存在强相关性。
英文摘要：
We investigate ionic fragmentation of CO$_2^{n+}$~\mbox{($2\le n\le 4$)} produced in collisions with Ar$^{q+}$~\mbox{($4\le q\le 16$)} projectiles at a collision velocity of $\approx$~0.3~a.u. For most projectile and fragmentation channel combinations, the shape of the kinetic energy release distribution (KERD) differs with the electron capture mediated charge change (\mbox{$Δq$}) in the scattered projectile: KERD for \mbox{$Δq = 2$} is broader at high KER than for \mbox{$Δq =1$}. The difference generally diminishes with increasing projectile charge. Two deviations in this general trend are seen in the fragmentation of CO$_2^{3+}$, one for Ar$^{4+}$ impact in the high KER region and the other for Ar$^{6+}$ impact in the low KER region. The calculated reaction windows for multielectron capture within the framework of the extended classical over-the-barrier model (ECOBM) indicate that while ionization of the target occurs via multielectron capture, the scattered projectile may subsequently undergo multi-fold autoionization. Interpreting projectile autoionization to be a consequence of capture into highly excited states and high fragment KER to be a consequence of excitation of the ionized target to high-lying states, we find a strong dependence between the target and scattered projectile excitations.
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