Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan.
J Chem Phys. 2013 Feb 21;138(7):074305. doi: 10.1063/1.4790599.
Circular dichroism (CD) spectroscopy in the soft x-ray energy region is a new tool to study the local structure of chiral materials. In this paper, we introduce a method to measure high-quality CD spectra in the oxygen K-edge energy region. Characteristic CD spectra of thin films of the amino acids L-tyrosine and L-aspartic acid are reported and compared with those of films of L-alanine and L-serine. The signals from the oxygen 1s → π∗ transitions of COO-, which is a common moiety in these amino acids, reflect the local geometry of each amino acid.
圆二色性（CD）光谱在软 X 射线能量区域是一种研究手性材料局部结构的新工具。本文介绍了一种在氧 K 边能量区域测量高质量 CD 光谱的方法。报告了 L-酪氨酸和 L-天冬氨酸薄膜的特征 CD 光谱，并与 L-丙氨酸和 L-丝氨酸薄膜的光谱进行了比较。COO-的氧 1s→π∗跃迁的信号，这是这些氨基酸中的常见部分，反映了每个氨基酸的局部几何形状。
