Turchini Stefano, Zema Nicola, Zennaro Stefano, Alagna Lucilla, Stewart Brian, Peacock Robert D, Prosperi Tommaso
Istituto di Struttura della Materia CNR, Area della Ricerca di Roma1, CP 10, 00016 Monterotondo Stazione, Rome, Italy.
J Am Chem Soc. 2004 Apr 14;126(14):4532-3. doi: 10.1021/ja039348v.
We have measured for the first time the X-ray natural circular dichroism (XNCD) of a chiral molecule in an isotropic medium. In this condition the only surviving term contributing to CD is the cross product between the electric dipole and the magnetic dipole transition moments. The non-zero value of the magnetic dipole transition moment in a 1s-to-valence electron transition is attributed to contribution of valence states to core molecular orbitals. These results open the way to a "local" chiral molecular analysis and to the study of stereochemically selected photochemical processes.
我们首次测量了各向同性介质中手性分子的X射线自然圆二色性（XNCD）。在这种情况下，对圆二色性有贡献的唯一留存项是电偶极矩和磁偶极矩跃迁矩之间的叉积。1s到价电子跃迁中磁偶极矩的非零值归因于价态对核心分子轨道的贡献。这些结果为“局域”手性分子分析以及立体化学选择光化学过程的研究开辟了道路。
