Hole Burning Studies of Electric Fields in Organic Solids

在这个项目中的物理化学计划的化学 作者：Bryan E.加州大学的科勒在 滨江将从事有机固体电场的研究 使用烧孔光谱技术。 以往的成功经验 测量和解释外部电场对 过渡能是拟议研究的基础， 分子系统中分子位置的内部电场。 具体地说，电场对线性多烯激发的影响 能量，以及外部压力对电效应的影响 场线性多烯激发能，将被确定为 几何形状可以在其中被 通过标准分子动力学技术计算。 更复杂 系统将可用于调查， 通过结合测量和 理论模拟 大多数理论模型用于 点偶极子内电场的确定 近似，这是发现只有定性成功。 的 所提出的研究旨在通过实验测量磁场 使用多烯掺杂的烷烃晶体。 我们对有机固体电子结构的理解 解决方案来自光谱学。 的量 可以从给定的光学系统中提取的明确信息 光谱增加，如果调查中的合奏， 同质的 这可以通过以下几种方法中的一种来完成： 分辨率位点选择光谱学，例如，烧孔光谱学 通过这种技术，分辨率提高了一个因素， 已经实现了数十万。 这反过来又使 弛豫过程的研究，例如，光学 失相和光谱扩散;有机固体中的能量传递; 生物系统中生物物理过程的表征; 有机聚合物在光学数据存储和全息照相中的应用 等人 在这个项目中进行的研究将 有助于更好地理解各种光学过程 固体有机系统，并可能导致用于光学系统的改进材料， 和电子设备。

In this project in the Physical Chemistry Program of the Chemistry Division, Prof. Bryan E. Kohler of the University of California at Riverside will engage in a study of electric fields in organic solids using the technique of hole burning spectroscopy. Previous successes for measuring and interpreting the effects of external electric fields on transition energies are the bases for the proposed research to map out the internal electric fields at a molecular site in a molecular system. Specifically, the effets of electric fields on linear polyene excitation energy, and the effect of external pressure on the effect of electric field on linear polyene excitation energy, will be determined for a number of different guest-host systems where the geometry can be calculated by standard molecular dynamics techniques. More complex systems will become available for investigation with the refinement of the interpretative model through a combination of measurement and theoretical simulation. Most theoretical models used for the determination of internal electric fields assume the point dipole approximation, which is found to be only qualitatively successful. The proposed investigations are designed to experimentally measure the fields using polyene doped alkane crystals. Much of our understanding of electronic structure of organic solid solutions is derived from optical spectroscopy. The amount of unambiguous information that can be extracted from a given optical spectrum is increased if the ensemble under investigation is made more homogeneous. This may be done by one of several methods of high resolution site selective spectroscopy, e.g., hole burning spectroscopy. With this technique resolution enhancements by a factor of up to one hundred thousand have been achieved. This in turn has allowed the investigations of relaxation processes such as, for example, optical dephasing, and spectral diffusion; energy transfer in organic solids; the characterization of photophysical processes in biological systems; applications of organic polymers to optical data storage and holography; and others. The research to be conducted in this project will contribute to a better understanding of optical processes in diverse solid organic systems and may lead to improved materials used in optical and electronic devices.