使用KLL-Auger电子技术通过快速碳离子从腺嘌呤和CO2分子中捕获K-K电子,X-Ray Spectrometry

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使用KLL-Auger电子技术通过快速碳离子从腺嘌呤和CO2分子中捕获K-K电子
X-Ray Spectrometry ( IF 1.5 ) Pub Date : 2019-06-06 , DOI: 10.1002/xrs.3078
Chandan Bagdia ₁ , Shamik Bhattacharjee ₁ , Madhusree Roychowdhury ₁ , Anuvab Mandal ₁ , Gregory Lapicki ₂ , Lokesh C. Tribedi ₁

Affiliation

实验测量布拉格峰能量区域中的总电子转移截面对于了解生物分子系统中的能量损失非常重要。在这项研究中，我们测量了与快速（2.5-5 MeV / u）C离子碰撞时腺嘌呤（C ₅ H ₅ N ₅）的状态选择，K-K电子捕获和K-电离截面。将这些与较小的气体分子CO ₂的数据进行比较。这些来自对KLL-Auger电子发射量作为射弹电荷状态的函数的研究。的K-电离横截面（σ _ķ我）数据与ECUSAR（具有能量损失[E]，库仑挠度[C]和相对论[R]校正的联合和分离原子[USA]近似）进行比较。测得的σ _ķ我的数据和计算有较好的一致性。的K-K传递的横截面（σ _{ķ - ķ}）数据与CPSSR相比（扰动静止状态[PSS]库仑偏转[C]和相对论修正[R]）计算该低估这种对称碰撞所测量的数据系统。的能量依赖性σ _{ķ - ķ}与模型所预测的急剧变化相反，发现腺嘌呤的α-内酰胺是平坦的。发现K转移截面占K电离的很大一部分。

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K‐K electron capture from adenine and CO2 molecule by fast carbon ions using KLL‐Auger electron technique

The experimental measurement of total electron transfer cross section in Bragg peak energy region is important to understand energy loss in the biomolecular system. In this study, we have measured state selective, K‐K electron capture and K‐ionization cross sections for adenine (C ₅H ₅N ₅) in collisions with fast (2.5–5 MeV/u) C ions. These are compared with the data for smaller gas molecule, CO ₂. These are derived from a study of the KLL‐Auger electron emission yields as a function projectile charge state. The K‐ionization cross‐section (σ_KI) data are compared with the ECUSAR (united and separated atom [USA] approximation with energy loss [E], Coulomb deflection [C], and relativistic [R] corrections) model calculation. The measured σ_KI data and the calculations are in good agreement. The K‐K transfer cross‐section (σ_K−K) data are compared with the CPSSR (perturbed stationary state [PSS] with Coulomb deflection [C] and relativistic corrections [R]) calculation that underestimates the measured data for such symmetric collision system. The energy dependence of σ_K−K for adenine is found to be flat in contrast to a sharp variation predicted by the model. The K‐transfer cross section is found to be substantial fraction of the K‐ionization.

更新日期：2019-06-06

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