R-matrix study of elastic and inelastic electron collisions with cytosine and thymine

R-matrix study of elastic and inelastic electron collisions with cytosine and thymine
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弹性和非弹性电子与胞嘧啶和胸腺嘧啶碰撞的 R 矩阵研究

DOI:
10.1088/0953-4075/45/17/175203
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发表时间:
2012
期刊:
Atomic, Molecular and Optical Physics
影响因子:
--
通讯作者:
Dora A
Dora A
中科院分区:
--
文献类型:
--
作者:
Dora A

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采用r -矩阵法进行了低能电子与气相DNA嘧啶碱基(胞嘧啶和胸腺嘧啶)碰撞的从头计算。阴离子的低洼共振态是由碱基捕获电子形成的,使用不同层次的理论,包括静态交换、静态交换加极化和紧密耦合近似来确定。对于这两种碱基,我们的所有散射模型都发现在10 eV以下有三个2 A''(π)对称的形状共振,与其他计算和实验观察一致。除此之外,在胸腺嘧啶的所有模型和胞嘧啶的最佳模型(即非收缩紧密耦合近似)中都发现了第四种2a”共振。该模型在6-7 eV范围内的两个系统中放置了第四个2a”共振。没有证据表明在这两个系统中存在低洼的费什巴赫共振。给出了电子弹性碰撞和非弹性碰撞的积分截面。
Ab initio scattering calculations for low-energy electron collisions with gas-phase DNA pyrimidine bases (cytosine and thymine) are performed using the R-matrix method. The low-lying resonant states of the anions, formed due to electron capture by the bases, are identified using different levels of theory, including static exchange, static exchange plus polarization, and close-coupling approximations. For both the bases, all of our scattering models find three shape resonances of 2 A''(π) symmetry lying below 10 eV, in accordance with other calculations and experimental observations. In addition to these, a fourth 2 A''resonance is found in all models for thymine and in our best model, ie the uncontracted close-coupling approximation, for cytosine. This model places the fourth 2 A''resonance in both systems in the 6–7 eV range. No evidence is found for the presence of low-lying Feshbach resonances in either system. Integral cross sections for electronically elastic and inelastic collisions are also presented.
尿嘧啶和盐尿嘧啶中的键断裂和临时阴离子状态:对 DNA 碱基的影响。
DOI: --
发表时间: 2004
影响因子: 8.6
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发表时间: 2005
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发表时间: 2012-03-01
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