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首页> 外文学位 >SCATTERING OPTICAL ACTIVITY OF CHIRAL MOLECULES: CIRCULAR INTENSITY DIFFERENTIAL SCATTERING AND CIRCULAR DIFFERENTIAL IMAGING (LIGHT).
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SCATTERING OPTICAL ACTIVITY OF CHIRAL MOLECULES: CIRCULAR INTENSITY DIFFERENTIAL SCATTERING AND CIRCULAR DIFFERENTIAL IMAGING (LIGHT).

机译：手性分子的散射光活动：圆强度微分散射和圆微分成像（光）。

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摘要

Theoretical treatments are presented for two new techniques based on the ability of chiral molecules to preferentially scatter or absorb right and left circulatory polarized light. The two techniques are circular intensity differential scattering (CIDS) and circular differential imaging (CDI). Circular intensity differential scattering is the fractional difference in the scattering cross sections for left and right circularly polarized light for optically active (chiral) molecules. A circular differential image is the difference in images formed under a microscope using right and left circularly polarized illumination.; For circular intensity differential scattering we first present a theory based on classical electrodynamics for scattering in the second Born approximation. This theory is based on earlier work by Bustamante, Maestre, and Tinoco, for scattering in the first Born approximation. The extension of the CIDS theory to the second Born approximation has resulted in the prediction of qualitatively new behavior in the CIDS patterns, most notably CIDS for forward scattered light and CIDS for systems of isotropic scatterers. A number of model computations are presented. Next, a quantum mechanical theory for CIDS is presented. This theory is similar in approach to the work done by Barron and Buckingham. The quantum mechanical theory uses the first Born approximation, but is valid for cases where magnetic effects are important (notably spin effects) and where the size of the scatterer is not small compared to the wavelength of the incident light. The quantum mechanical theory also describes inelastic scattering processes such as Raman CIDS.; For circular differential imaging we present a theory based in part on the classical theory for CIDS mentioned above. Two types of differential images are possible: (a) darkfield images formed from light reflected or scattered by the sample, and (b) brightfield images formed from light transmitted through the sample. The sign and magnitude of each feature in a circular differential image are proportional to the optical activity of the corresponding feature in the sample. For incident light with wavelengths in the visible, the darkfield circular differential images are mostly sensitive to large features with dimensions similar to the wavelength, while the brightfield images are most sensitive to the short range molecular order. . . . (Author's abstract exceeds stipulated maximum length. Discontinued here with permission of author.) UMI
机译：基于手性分子优先散射或吸收左右循环偏振光的能力，针对两种新技术提出了理论方法。两种技术是圆形强度微分散射（CIDS）和圆形微分成像（CDI）。圆形强度微分散射是光学活性（手性）分子的左和右圆偏振光在散射截面中的分数差。圆差分图像是在显微镜下使用左右圆偏振照明形成的图像中的差异。对于圆形强度微分散射，我们首先提出基于经典电动力学的第二波恩近似散射理论。该理论基于Bustamante，Maestre和Tinoco的早期工作，用于第一次Born近似中的散射。将CIDS理论扩展到第二个Born逼近，可以预测CIDS模式中的定性新行为，最引人注目的是前向散射光的CIDS和各向同性散射体系统的CIDS。提出了许多模型计算。接下来，介绍了CIDS的量子力学理论。这种理论与巴伦和白金汉所做的工作相似。量子力学理论使用了第一波恩近似，但是对于磁性效应很重要（特别是自旋效应）并且散射体的大小与入射光的波长相比不小的情况有效。量子力学理论还描述了非弹性散射过程，例如拉曼CIDS。对于圆形差分成像，我们提出了部分基于上述CIDS经典理论的理论。两种类型的差分图像是可能的：（a）由样品反射或散射的光形成的暗场图像，以及（b）由透射过样品的光形成的明场图像。圆形差分图像中每个特征的符号和大小与样品中相应特征的光学活性成正比。对于波长在可见光范围内的入射光，暗场圆形差分图像对尺寸与波长相似的大型特征最为敏感，而明场图像对短程分子阶最敏感。 。 。 。 （作者的摘要超出了规定的最大长度。经作者许可，在此处停产。）UMI

著录项

  • 作者

    KELLER, DAVID JOHN.;

  • 作者单位

    University of California, Berkeley.;

  • 授予单位 University of California, Berkeley.;
  • 学科 Biophysics General.
  • 学位 Ph.D.
  • 年度 1984
  • 页码 252 p.
  • 总页数 252
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物物理学;
  • 关键词

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