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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Analytic three-dimensional'MLR'potential energy surface for CO2-He,and its predicted microwave and infrared spectra
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Analytic three-dimensional'MLR'potential energy surface for CO2-He,and its predicted microwave and infrared spectra

机译:CO2-He的三维三维“ MLR”势能面及其预测的微波和红外光谱

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摘要

A three-dimensional,analytic potential energy surface for CO2-He that explicitly incorporates its dependence on the Q3 asymmetric-stretch normal-mode coordinate of the CO2 monomer has been obtained by least-squares fitting new ab initio interaction energies to a new three-dimensional MorseJLong-Range(3D-MLR)potential function form.This fit to 2832 points has a root-mean-square(RMS)deviation of 0.032 cm~(-1)and requires only 55 parameters.The resulting pure ab initio potential provides a good representation of the experimental microwave and infrared data:for 51 pseudo microwave and 49 infrared transitions the RMS discrepancies are 0.0110 and 0.0445 cm~(-1),respectively.Scaling this surface using only two morphing parameters yields an order of magnitude better agreement with experiments,with RMS discrepancies of only 0.0025 and 0.0038 cm~(-1),respectively.The calculated infrared band origin shift associated with the v3 fundamental of CO2 is 0.109 cm~(-1),in good agreement with the(extrapolated)experimental value of 0.095 cm~(-1).
机译:通过最小二乘将新的从头算起的相互作用能拟合为新的三态分子,获得了CO2-He的三维分析势能面,该面明确地将其依赖关系纳入了CO2单体的Q3不对称拉伸正态坐标。维MorseJLong-Range(3D-MLR)势函数形式。该函数适合2832个点,均方根(RMS)偏差为0.032 cm〜(-1),仅需55个参数,所得纯ab初始电势提供很好地表示了实验微波和红外数据:对于51个伪微波和49个红外跃迁,RMS差异分别为0.0110和0.0445 cm〜(-1)。仅使用两个变形参数缩放该表面可获得更好的数量级一致性通过实验,RMS差异分别仅为0.0025 cm〜(-1)和0.0038 cm〜(-1)。计算出的与CO2 v3基本相关的红外波段原点偏移为0.109 cm〜(-1),与(测量值0.095 cm〜(-1)。

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