Low-energy positron scattering: Modelling the formation of bound [M − e+] states in deformed polyatomic molecules
Low-energy positron scattering: Modelling the formation of bound [M − e+] states in deformed polyatomic molecules
复制标题
低能正电子散射：模拟变形多原子分子中束缚 [M − e+] 态的形成
DOI：
10.1209/epl/i2004-10225-3
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
F. Gianturco
中科院分区：
文献类型：
--
作者：
T. Nishimura;F. Gianturco
用量子计算方法计算了低能正电子与气态乙炔分子碰撞的散射长度A0，这些分子在散射过程中处于ν5振动模的“扭曲”状态。随着分子结构经历越来越大的弯曲模式的扭曲，在与线性几何构型成约16°的弯曲变形时，出现了明显的亚稳态特征(A0的符号变化)。评估了这种状态对标题分子湮没参数大小的影响，并讨论了对更大的多原子学的影响。
Quantum calculations are carried out to evaluate the scattering length A0 for low-energy positron collisions with gaseous acetylene molecules which are being "distorted" in their ν5 vibrational mode during the scattering. As the molecular structure undergoes increasingly larger distortions of that bending mode, the clear signature of a metastable state (change of sign for A0) appears at bending deformation of about 16° from the linear geometry. The effects of such state on the size of the annihilation parameters of the title molecule are evaluated and the implications for larger polyatomics are discussed.