共查询到20条相似文献,搜索用时 140 毫秒
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两种哈密顿量划分的单参考态微扰展开式的大小一致性研究 总被引:1,自引:0,他引:1
利用一个含N个氢分子的超分子模型, 从解析的角度仔细地分析了相应于两种哈密顿量划分方式的单参考态微扰展开式前四级能量的大小一致性. 对于Epstein-Nesbet划分, 微扰展开式是大小一致的. 而对于另一种划分(Chen, F; Davidson, E. R.; Iwata, S. Int. J. Quantum Chem., 2002, 86: 256, 见公式(24)的讨论), 其展开式大小不一致. 但将它的分母作泰勒展开, 经过重新整理, 将那些大小不一致的项消去后, 得到的新微扰展开式是逐项大小一致的. 相似文献
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吉布斯 杜亥姆方程是物理化学及化学热力学中的主要方程 ,在处理溶液问题时有广泛的应用 ,由其出发还可导出马居耳 杜亥姆 (Margules Duhem)等主要公式。该方程的推导方法虽然简单 ,但是在国内外流行的 2 0余部物理化学及相关教材中 ,推导方法都有问题。笔者对此进行了探讨 ,指出了错误的原因 ,并提出了正确的处理方法。 相似文献
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物理化学尤其是化学热力学公式多、易混淆,学生记忆负担较重。介绍了巧记物理化学中热力学函数关系式和简要分析二元系统固液平衡相图的方法,并以熵变计算为例介绍了物理化学的解题技巧。 相似文献
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化学热力学中极强调公式成立的条件。一般来说,公式成立的条件应当就是公式导出过程中所用到的条件;公式也只有在满足导出条件的前提下才能被应用。然而,许多中外关于物理化学或化学热力学的著作中,对于“两相平衡时存在于两相的物质的化学位相等”这一结论,却普遍地存在着应用条件和导出条件不相一致的问题。大多数著作中对“相平衡时化学位相等”的推导是这样的: 相似文献
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化学势概念的正确理解及应用杨永华(吉林大学化学系长春130023)化学势的概念是物理化学中的基本概念之一。它在化学热力学、化学动力学、电化学及统计热力学中均有重要的应用。有关化学势的概念在各教材中都做了确切的定义和严谨的描述,但是在具体应用这一概念的... 相似文献
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化学实验手段微机化的研究与应用 总被引:2,自引:0,他引:2
阐述了在化学实验手段微机化方面的研究与应用工作,尤其是重点介绍了通用型计算机辅助化学实验测量系统研制的基本过程以及该系统在物理化学实验课程教学中的应用情况。 相似文献
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物理化学课程内容的编排顺序是物理化学教学中的核心问题之一,教指委发布的《化学类专业化学理论教学建议内容》对其并未明文规定,经典教材对此处理各有不同。经过对比和分析不同经典教材的编排顺序差别,可以看出物理化学的学科思维和认知规律是决定编排顺序的两大原则。依据学科思维从空间、时间、体系等3个维度为物理化学课程的核心内容画出逻辑关系图,并结合认知规律提出了多种编排内容的方式。 相似文献
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A new approach based upon the Taylor series method is proposed for propagating solutions of the time‐dependent Schrödinger equation. Replacing the spatial derivative of the wave function with finite difference formulas, we derive a recursive formula for the evaluation of Taylor coefficients. The automatic differentiation technique is used to recursively calculate the required Taylor coefficients. We also develop an implicit scheme for the recursive evaluation of these coefficients. We then advance the solution in time using a Taylor series expansion. Excellent computational results are obtained when this method is applied to a one‐dimensional reflectionless potential and a two‐dimensional barrier transmission problem. © 2010 Wiley Periodicals, Inc. Int J Quantum Chem, 2010 相似文献
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L. A. Bulavin D. A. Gavryushenko V. M. Sysoev P. A. Yakunov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2010,84(2):225-228
The chemical potential of components of a binary solution is calculated using the expansion of the external field potential
in a Taylor series. An expansion of the chemical potential in terms of concentration-concentration direct correlation functions
of all orders is obtained. For a plane-parallel pore with an exponential near-wall potential, a solution to the obtained differential
equation is constructed in the smooth-inhomogeneity approximation. 相似文献
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R.G. Woolley 《Journal of mathematical chemistry》1998,23(1-2):3-12
The paper surveys how chemistry has developed over the past two centuries starting from Lavoisier’s classification of the
chemical elements at the end of the eighteenth century; the subsequent development of the atomic–molecular model of matter
preoccupied chemists throughout the nineteenth century, while the results of the application of quantum theory to the molecular
model has been the story of this century. Whereas physical chemistry originated in the nineteenth century with the measurement
of the physical properties of groups of chemical compounds that chemists identified as families, the goal of chemical physics
is the explanation of the facts of chemistry in terms of the principles and theories of physics. Chemical physics as such
was only possible after the discovery of the quantum theory in the 1920’s. By then the first of the sub‐atomic particles had
been discovered and seemingly it is no longer possible to discuss chemical facts purely in terms of atoms and molecules –
one has to recognize the electron and the nucleus, the parts of atoms. The combination of classical molecular structure with
the quantum properties of the electron has given us a tremendously successful account of chemistry called ‘quantum chemistry’.
Yet from the perspective of the quantum theory the deepest part of chemistry, the existence of chemical isomers and the very
idea of molecular structure that rationalizes it, remains a central problem for chemical physics.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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介绍了相对活度的概念和化学势表达式的通式在物理化学课程中的一些应用,有助于学生深刻理解和系统掌握相关知识,对提高教师的授课效率和学生的学习效率均有一定的帮助。 相似文献
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Rossmeisl J Nørskov JK Taylor CD Janik MJ Neurock M 《The journal of physical chemistry. B》2006,110(43):21833-21839
Ab initio density functional theory is used to calculate the electrochemical phase diagram for the oxidation and reduction of water over the Pt(111) surface. Three different schemes proposed in the literature are used to calculate the potential-dependent free energy of hydrogen, water, hydroxyl, and oxygen species adsorbed to the surface. Despite the different foundations for the models and their different complexity, they can be directly related to one another through a systematic Taylor series expansion of the Nernst equation. The simplest model, which includes the potential only as a shift in the chemical potential of the electrons, accounts very well for the thermochemical features determining the phase-diagram. 相似文献
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The universal gas constant R is an important constant in physics, and one of the vital fundamental constant throughout the teaching of general chemistry. This article aims to present a general review about the universal gas constant to the science and engineering majored students, including its history, determination, physical meaning and applications in chemical education. The choice of R values under various conditions is also provided to help students better understand and master basic concepts. 相似文献
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