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:
--
通讯作者:
M. Boczar
M. Boczar
中科院分区:
--
文献类型:
--
作者:
M. Wójcik;Krzysztof Szczeponek;M. Boczar

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采用B3 LYP/6-311++G** 方法对苯甲酸二聚体的稳定结构和鞍点结构进行了从头计算.质子隧穿的能垒为6.5千卡/摩尔。包括耦合到质子隧穿模式的模式的正常模式的频率已被计算。由对称模耦合势和压缩双阱势构成的二维模型势与计算的能垒、几何和频率进行了拟合,并用于分析质子动力学。计算的质子隧穿能量分裂的振动基态的低频模式是~230 cm-1。二维模型预测了隧道劈裂随平面模激发的单调增加。根据耦合参数的符号,面外模式可以抑制或促进分裂。
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.
S.Takada:“振动激励对多维隧道效应的影响:托酚酮中的一般研究和质子隧道效应”J.Chem.Phys.(印刷中)。
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Kaori Nishi:“喷射冷却的 5-甲基-9-羟基苯甲酮 (OH) 和 5-甲基-9-羟基苯甲酮 (OD) 中甲基的内旋转与质子/氘核转移之间的耦合:耦合势的隧道速率依赖性《化学生理学杂志》
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