A quasi-optically based, sub-terahertz, circular dichroism (CD) spectrometer is demonstrated on the model protein, myoglobin, over waveguide bands D (110–170 GHz) and H (220–325 GHz). In doing so, an equivalent methodology is propounded for acquiring cross-polar spectra that eliminates the need for having to physically rotate the receive-horn through 90°. A significant source of systematic-error is, thereby, eliminated (and, no less, random-error that follows when cabling is moved). The “zero-crossing” points of CD spectra are characterized as they are correlated with traditional far-ultraviolet CD spectra for given environmental parameter settings of, for example, pH and/or sample concentration.

中文翻译：

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溶剂化肌红蛋白的准光学亚太赫兹圆二色光谱

在模型蛋白质肌红蛋白上演示了基于准光学的亚太赫兹圆二色性 (CD) 光谱仪，波导带 D (110–170 GHz) 和 H (220–325 GHz)。这样做时，提出了一种等效的方法来获取交叉极化光谱，无需将接收喇叭物理旋转 90°。从而消除了系统误差的一个重要来源（并且同样消除了移动电缆时随之而来的随机误差）。CD 光谱的“过零”点的特征在于它们与传统的远紫外 CD 光谱相关，用于给定环境参数设置，例如 pH 和/或样品浓度。