Theoretical calculation of positron annihilation spectrum using positron‐electron correlation‐polarization potential

Theoretical calculation of positron annihilation spectrum using positron‐electron correlation‐polarization potential
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利用正电子电子相关极化势理论计算正电子湮没谱

DOI:
10.1002/qua.26376
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发表时间:
2020
期刊:
Int. J. Quantum Chem.
影响因子:
--
通讯作者:
M. Tachikawa
M. Tachikawa
中科院分区:
--
文献类型:
--
作者:
Y. Sugiura;T. Takayanagi;M. Tachikawa

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采用正电子相关极化势模型计算了二硫化碳和苯的湮没谱。我们假设,正电子被捕获的振动激发态的目标分子通过振动Feshbach共振。使用标准简正模表示,我们计算了每个振动模式的共振能量和宽度。共振宽度是用费米黄金法则近似计算的,其中应用了时间相关的波包方法。我们发现,红外激活模式的振动共振在共振湮灭中起主导作用;然而,红外非激活模式也通过极化率沿沿着正常模式坐标的变化对湮灭谱做出贡献。
The positron‐electron correlation‐polarization potential model is used to calculate annihilation spectra of carbon disulfide and benzene. We assume that the positron is captured in the vibrationally excited states of the target molecule through vibrational Feshbach resonances. Using the standard normal mode representation, we calculated the resonance energies and widths for each vibrational mode. The resonance widths were calculated with Fermi's Golden Rule approximation, where the time‐dependent wave packet approach has been applied. We found that vibrational resonances of infrared‐active modes play a dominant role in resonant annihilation; however, infrared‐inactive modes also contribute to the annihilation spectrum through polarizability changes along normal mode coordinates.
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