又一篇综述正式发表

2008.10.18

一个小时前刚收到Taylor & Francis出版社的email，我们那篇International Reviews in Physical  Chemistry上的综述文章（IRPC, 27，629-664，2008.）终于正式印刷出版。我赶紧把这篇文章的电子版email给我们所有的学生。

这篇文章是我们对于界面非线性光学微观理论的总结，主要是解决界面局域场的分子理论问题。因为提出了新的概念和方法，以及提供了新的推导的细节，所以并不是普通意义上的总结已发表工作的那类综述。更重要的是这些处理和概念同样可以用来回答偏振红外光谱和椭圆偏光光谱中存在的分子理论问题。因为一直是用宏观的模型来处理，那些研究中其实也有很多没法解决的问题。我们花了好几年的时间来发展这些相关的理论和概念，并且同时把相关的理论问题做了一个仔细的总结，给出了这些问题的清楚答案。唯一的遗憾是我们当时应该在这篇文章中多加几句话，给出其中两个简化形式的直接表达式。这样后面的人在用的时候就不用再自己推导，虽然这些推导很简单也很直接，但毕竟对不熟的人会是个小小的考验。

在此之前我们已经发表了两篇关于我们发展的界面光学二次谐波和和频振动光谱的定量测量和偏振分析方法的综述文章。要进入这个领域做研究，除了沈元壤先生等人最初的原始文献之外，读懂这两篇之后会很容易理解整个领域中的细节问题。我们最近正在思考系统处理非线性光学界面手性检测中的定量测量和分析问题，以及界面分子振动态和电子态耦合的非线性光学理论与实验问题。目前为止，其中最重要的问题都已经搞清楚了。

以下是这篇IRPC文章的相关信息。

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Microscopic molecular optics theory of surface second harmonic generation and sum-frequency generation spectroscopy based on the discrete dipole lattice model

Authors: De-Sheng Zheng;  Yuan Wang;  An-An Liu; Hong-Fei Wang* Affiliation:  Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China

DOI: 10.1080/01442350802343981 
 Published in:  International Reviews in Physical Chemistry, Volume 27, Issue 4 October 2008 , pages 629 - 664
Subjects: Chemical Physics; Physical Chemistry;

Abstract
The aim of this work is to present a coherent description of the microscopic theory of surface nonlinear optical spectroscopy for solving practical problems in understanding the details of the molecular interface. We review the related issues and show that by following microscopic molecular optics theory, second harmonic generation (SHG), as well as sum-frequency generation vibrational spectroscopy (SFG-VS), radiation from a monolayer or submonolayer can be rigorously treated as the radiation from an induced dipole lattice at the interface. In this approach, the introduction of an infinitesimally thin polarization sheet as in macroscopic theory with the Maxwell equations and the boundary conditions is no longer necessary. As a direct consequence, the ambiguity of the unaccounted dielectric constant of the interfacial layer is no longer an issue. Moreover, the anisotropic two-dimensional microscopic local field factors can be explicitly defined with the linear polarizability tensors of the interfacial molecules. Based on the planewise dipole sum rule in the molecular monolayer, experimental tests of this microscopic treatment with SHG and SFG-VS are discussed. 

Keywords: interface; submonolayer; molecular orientation; second harmonic generation (SHG); sum frequency generation vibrational spectroiscopy (SFG-VS); Maxwell equations 

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