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首页> 外文期刊>Chemical Physics Letters >Davydov coupling as a factor influencing the H-bond IR signature: Computational study of the IR spectra of 3-thiopheneacrylic acid crystal
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Davydov coupling as a factor influencing the H-bond IR signature: Computational study of the IR spectra of 3-thiopheneacrylic acid crystal

机译:达维多夫耦合是影响H键红外签名的因素:3-噻吩丙烯酸晶体红外光谱的计算研究

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this work, we have studied the role played by Davydov coupling in the evolution of the fine structure of the IR spectra of 3-thiopheneacrylic acid dimer crystal. For this purpose, we took into account the linear dependence of the Davydov coupling on the position coordinate Q( i = 1, 2) of the slow frequency (O) over right arrow -H center dot center dot center dot(O) over right arrow mode of the two H-bond bridges of the cyclic dimer. The Davydov coupling VD term was expanded up to first order with respect to the slow mode coordinate Q. We have considered: V-D(Q(1), Q(2)) = v(D)(0) + Theta (Q(1) + Q(2)). That leads to the anharmonic expression of the Davydov coupling parameter V-D: V-D (Q(g)) = V-D(0) + root 2 Theta Qg within the symmetrized coordinates. The effect of the second order parameter (0) of Davydov coupling on to the spectral density was undertaken. The numerical calculations clearly show that the crystal spectral properties of the infrared nu(O-H) stretching band remain in a close relation with the new anharmonic coupling parameter and provide a direct evidence of the increase of the level density and the spectral broadening. (C) 2016 Elsevier B.V. All rights reserved.
机译:在这项工作中,我们研究了达维多夫偶联在3-噻吩丙烯酸二聚体晶体红外光谱精细结构演变中的作用。为此,我们考虑了达维多夫耦合对右箭头上慢速频率(O)的位置坐标Q(i = 1,2)的线性依赖性-H中心点中心点中心点中心点(O)循环二聚体的两个氢键桥的箭头模式。 Davydov耦合VD项相对于慢模式坐标Q扩展到一阶。我们已经考虑:VD(Q(1),Q(2))= v(D)(0)+ Theta(Q(1 )+ Q(2))。这导致Davydov耦合参数V-D的非调和表达式:V-D(Q(g))= V-D(0)+对称坐标内的根2 Theta Qg。进行了戴维多夫耦合的二阶参数(0)对光谱密度的影响。数值计算清楚地表明,红外nu(O-H)拉伸带的晶体光谱特性与新的非谐耦合参数保持密切关系,并提供了能级密度增加和光谱展宽的直接证据。 (C)2016 Elsevier B.V.保留所有权利。

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