| 有序分子系统的线性与非线性光谱学的简化描述 |
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| 作者单位： | 中国科学院化学研究所分子科学中心分子反应动力学国家重点实验室,北京,100080 |
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| 基金项目： | 国家自然科学基金;Ministry of Science & Technology (MOST);国家重点基础研究发展计划(973计划) |
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| 摘 要： |
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| 关 键 词： | 线性与非线性光谱 光学二次谐波 和频振动光谱 广义取向泛函 有序分子体系 |
A Simplified Formulation of Linear and Nonlinear Spectroscopy of Ordered Molecular Systems |
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| Authors: | Wang Hongfei |
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| Abstract: | A simplified formulation for treating the linear and nonlinear spectroscopy of ordered molecular systems is presented，in order to help experimentalists to have an explicit physical picture and quantitative tool on using linear and nonlinear spectroscopy to study molecules in ordered molecular systems. This formulation is expended from our recent quantitative orientational and polarization treatment on second-order nonlinear spectroscopic techniques in interface studies，namely，the Second Harmonic Generation（SHG）and Sum Frequency Generation-Vibrational Polarization Spectroscopy（SFG-VPS）. The key to this formulation is to simplify the effective linear or nonlinear molecular susceptibility and construct the general orientational functional with a clear approach to calculate the orientational and intensity parameters from the experimental parameters，which determines the orientational and polarization behavior of the general orientational functional in a particular experimental configuration. Also discussed are the advantages of coherent spectroscopic techniques over incoherent ones for the accurate measurement of orientation and ordering of ordered molecular system. |
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| Keywords: | Linear and nonlinear spectroscopy，Second harmonic generation，Sum frequency generation vibrational spectroscopy，General orientational functional，Ordered molecular system |
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