Theoretical investigation of the binding of a positron to vibrational excited states of hydrogen cyanide molecule

Theoretical investigation of the binding of a positron to vibrational excited states of hydrogen cyanide molecule
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正电子与氰化氢分子振动激发态结合的理论研究

DOI:
10.1140/epjd/e2014-40799-9
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发表时间:
2014
期刊:
Euro. Phys. J. D
影响因子:
--
通讯作者:
Yukiumi Kita and Masanori Tachikawa
Yukiumi Kita and Masanori Tachikawa
中科院分区:
--
文献类型:
--
作者:
K. Yamada;Y. Kawashima;M. Tachikawa;Yukiumi Kita and Masanori Tachikawa

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我们从理论上分析了氰化氢(HCN)分子在振动激发态的正电子亲和能(PA),以阐明分子振动对正电子与分子结合的影响。用多组分分子轨道理论中的组态相互作用方法和变分蒙特卡罗方法对非简谐振动态进行了分析,发现CN和CH伸缩模的振动激发比振动基态的振动激发增强了PA值,而弯曲模的激发减弱了PA值。在基音和泛音的激发态上,基音和泛音的PA值分别为43.02 (1)和46.34 (2)mev。通过线性回归分析,我们证实了HCN分子在每个振动状态下的PA变化是由每个振动激发引起的永久偶极矩和偶极极化率的变化引起的。
We theoretically analyzed positron affinities (PA) of hydrogen cyanide (HCN) molecule at vibrational excited states to elucidate the effect of molecular vibrations on the binding of a positron to the molecule. Using the configuration interaction method in the multi-component molecular orbital theory and anharmonic vibrational state analysis with the variational Monte Carlo technique, we found that the vibrational excitations of the CN and CH stretching modes enhance the PA value compared to that of the vibrational ground state, whereas the excitation of bending mode deenhances it. The largest PA enhancement is found at the excited states of the CH stretching mode; the PA values are 43.02 (1) and 46.34 (2) meV for the fundamental tone and overtone states, respectively. With the linear regression analysis, we confirmed that the PA variation of HCN molecule at each vibrational state arises from the variation of permanent dipole moment and dipole-polarizability due to each vibrational excitation.
M.Tachikawa:“通过全 CI 波函数同时优化电子和正电子的高斯型函数指数 - 应用多组分分子轨道方法应用于正电子化合物的基态和激发态”化学物理
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