Theoretical Study of Multidimensional Proton Tunnelling in Benzoic Acid Dimer
Theoretical Study of Multidimensional Proton Tunnelling in Benzoic Acid Dimer
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苯甲酸二聚体多维质子隧道理论研究
DOI:
10.3390/i4070422
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发表时间:
2003
期刊:
影响因子:
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通讯作者:
M. Boczar
中科院分区:
文献类型:
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作者:
M. Wójcik;Krzysztof Szczeponek;M. Boczar
Ab initio B3LYP/6-311++G** calculations have been carried out for the benzoic acid dimer for the stable and saddle point structures. The energy barrier for the proton tunneling amounts to 6.5 kcal/mol. The normal mode frequencies have been computed including modes coupled to the proton tunneling mode. Two-dimensional model potentials, formed from symmetric mode coupling potential and squeezed double well potential, have been fitted to the calculated energy barrier, geometries and frequencies, and used to analyze proton dynamics. The calculated proton tunneling energy splitting in the vibrationally ground states of the low-frequency modes is ~230 cm-1. The two-dimensional model PES predict monotonic increase of the tunneling splitting with the excitation of the planar modes. Depending of the sign of the coupling parameter out-of-plane modes can either suppress or promote the splittings.
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