Detection Limits for Natural Circular Dichroism of Chiral Complexes in the X-ray Range
Detection Limits for Natural Circular Dichroism of Chiral Complexes in the X-ray Range
复制标题
X 射线范围内手性配合物天然圆二色性的检测限
DOI：
10.7567/jjaps.32s2.284
复制
发表时间：
1993
影响因子：
1.5
通讯作者：
F. Baudelet
中科院分区：
文献类型：
--
作者：
J. Goulon;F. Sette;C. Moise;A. Fontaine;Dantele Perey;P. Rudolf;F. Baudelet
尽管磁圆二向色性和法拉第旋转研究已在铁磁系统中金属原子的K-、L-和M-吸收边成功进行，但手性复合物的自然光学活性尚未在X射线范围内被明确检测到。我们回顾了一些理论论据，证实了光学不对称因子gσ在X射线范围内，特别是在K-吸收边的无取向粉末样品应该是非常小的。这一刺激性的挑战促使我们开始了一项密集的测量计划，旨在检测软X射线和“硬”X射线范围内的自然圆二色性。虽然我们的一些实验看起来与预期效应的存在一致，但由于存在微弱的残留信号，不幸的是，该信号无法消除，因此我们的结论还不能被认为是确定的。
Whereas both Magnetic Circular Dichroism and Faraday Rotation studies have been successfully carried out at the K-, L- and M-absorption edges of metal atoms in ferromagnetic systems, Natural optical activity of chiral complexes has not yet been detected quite unambiguously in the X-ray range. We review a number of theoretical arguments which confirm that the optical asymmetry factor gσ should be very small in the X-ray range for unoriented powdered samples, especially at the K-absorption edges. This stimulating challenge prompted us to start an intensive programme of measurements aimed at detecting natural circular dichroism in both the soft and “firm” X-ray ranges. Although some of our experiments look consistent with the presence of the expected effect, our conclusions cannot be taken yet as definitive due to the presence of a weak residual signal which, unfortunately, could not be eliminated.