报告题目: Effects of nuclear spin on quantum dynamics and symmetry: A case study for molecular boron rotors
报告摘要: Boron rotors 11B2@11B9-,11B3@11B10+,11B4@11B11-,11B6@11B13+, La-[11B2@11B18]-La consist of inner molecular “wheels” embedded in outer “bearings”. Weak interactions allow almost free rotations of the “wheels” in the pseudo-rotating “bearings”, from one global minimum (GM) structure to many other equivalent GMs. These large amplitude motions correspond to delocalized spatialeigenfunctionswith equal populations of all GMs. Totaleigenfunctionsconsist of products of the spatialeigenfunctionstimes nuclear spin functions. As a consequence, nuclear spins cause decisive quantum effects: (i) The local symmetry of the GMs is changed to global molecular symmetry. (ii) The molecular rotors can never be localized in a single GM. (iii) The rotors’ nuclear spins prohibit laser transitions between different nuclear spin isomers. (iv) As a consequence, lasers cannot induce rotations of the boron rotors. (v) Isotopic labelling causes quantum non-equidistribution. Quantum effects (i)-(v) cannot be described by means of classical molecular dynamics simulations.
报告人简介: JoernManz院士是世界著名物理化学家,德国科学院院士,德国柏林自由大学终身教授。J.Manz院士是超快飞秒动力学研究领域的创始人之一,在分子的超快量子动力学演化与激光超控分子量子态等方面作出了一系列开创性的工作,先后应邀在100多次国际会议上作邀请报告。J.Manz教授于2009年当选德国科学院院士,2012年,美国权威学术杂志J. Phys. Chem.出版一期论文集纪念Manz院士对超快飞秒动力学的贡献。J.Manz院士与国内相关院校开展了长期紧密的合作研究,自2013年1月起至今,J.Manz院士被聘为山西大学特聘教授,并于2014年入选山西省高校131领军人才(第一梯队),2018年入选首批“山西特聘专家”,2019年入选山西省百人计划。
主持联系人:李铮(Email:zheng.li@pku.edu.cn)
科学前沿报告会(594)