测量聚合物溶液中电光旋光度变化的装置

K. Weir, B. Jennings
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引用次数: 2

摘要

对于高度不对称的大分子,观察到的光学活性取决于分子相对于入射线偏振光传播方向的取向。脉冲电场的作用伴随着旋光度的瞬态变化。一种基于激光的仪器被组装起来以高精度测量这些微小的变化。详细描述了系统的细节,以及建立设计的理论考虑。通过对二氯乙烷中α -螺旋多肽- γ -苄基- l-谷氨酸溶液的测量,证明了该装置的性能。测量的灵敏度远远超过了先前对与-螺旋轴向有关的旋转功率的所有估计。
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Apparatus for the measurement of electro-optical rotation changes in polymer solutions
With highly asymmetric macromolecules, the observed optical activity depends upon the orientation of the molecules relative to the propagation direction of incident, linearly polarised light. Application of a pulsed electric field is accompanied by transient changes in the optical rotation. A laser-based apparatus has been assembled to measure these small changes with high precision. Details of the system are described along with the theoretical considerations upon which the design was established. The performance of the apparatus is demonstrated by measurements on solutions of the alpha -helical polypeptide poly- gamma -benzyl-L-glutamate in dichlorethane. The sensitivity of the measurements far exceeds all previous estimations of the rotatory powers associated with the alpha -helical axial directions.
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Apparatus for the measurement of electro-optical rotation changes in polymer solutions DESIGN NOTE: Simple oven design for highly reactive metal beam applications Ratio transformer bridge for the measurement of dielectric constant of lossy liquids Temperature resistant and vacuum tight LiF connections Accounting for the effects of gas species on piston gauge calculated area: absolute mode
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