论文标题
通过乘以重型离子撞击的生物学相关分子净电离的非扰动缩放行为
Non-perturbative scaling behavior for net ionization of biologically relevant molecules by multiply-charged heavy-ion impact
论文作者
论文摘要
最近开发的模型来描述涉及氢，碳，氮，氧和磷（H，C，N，O，P）等基本原子的质子碰撞，以治疗与带电离子的碰撞。离子原子碰撞是使用两中心基碱发电机方法（TC-BGM）计算的，该方法具有可靠的往绩记录，以产生电子捕获和电离的准确总横截面。然后使用原子净电离横截面组装两个用于离子 - 分子碰撞的模型：独立的原子模型（IAM），遵循Bragg添加性规则（标记为IAM-AR），以及所谓的像素计数方法（IAM-PCM）。后者产生的相对于最大值接近IAM-AR的横截面减少，因为它考虑了有效横截面区域的重叠性质。高电荷弹丸的IAM-PCM可导致相对于IAM-AR方法的净电离横截面的大大减少，并直接计算出弹丸费用$ q = 1、2、3 $。 IAM-PCM的缩放行为在各种能量$ e $中进行了研究，并以高$ e $收敛于IAM-AR。建立了经验缩放规则，该规则允许根据质子影响计算来重现这些结果。为Uracil目标提供了详细的比较（$ \ rm C_4 H_4 N_2 O_2 $），为此提供了其他理论和实验结果。基于从IAM-PCM数据得出的缩放模型，它显示了如何分别将带电的离子轰炸的尿酸和水的实验数据分别降低为有效$ q = 1 $跨截面，并将其与质子影响数据进行比较。
A recently developed model to describe proton collisions from molecules involving basic atoms such as hydrogen, carbon, nitrogen, oxygen and phosphorus (H, C, N, O, P) is extended to treat collisions with multiply charged ions. The ion-atom collisions are computed using the two-center basis generator method (TC-BGM), which has a proven track record of yielding accurate total cross sections for electron capture and ionization. The atomic net ionization cross sections are then used to assemble two models for ion-molecule collisions: an independent atom model (IAM) that follows the Bragg additivity rule (labeled IAM-AR), and also the so-called pixel-counting method (IAM-PCM). The latter yields reduced cross sections relative to IAM-AR near the maximum, since it takes into account the overlapping nature of effective cross sectional areas. The IAM-PCM for higher-charge projectiles leads to strong reductions of net ionization cross sections relative to the IAM-AR method, and is computed directly for projectile charges $Q=1, 2, 3$. The scaling behavior of the IAM-PCM is investigated over a wide range of energies $E$, and at high $E$ it converges towards the IAM-AR. An empirical scaling rule is established which allows to reproduce these results based on proton impact calculations. Detailed comparisons are provided for the uracil target ($\rm C_4 H_4 N_2 O_2$), for which other theoretical as well as experimental results are available. Based on the scaling model derived from the IAM-PCM data it is shown how the experimental data for uracil and water bombarded by multiply charged ions can be reduced to effective $Q=1$ cross sections respectively, and these are compared to proton impact data.
