Speaker: Cheng Yongjun , Shaanxi Normal University , YJC Physic s & Information technology@163.com
Introduction :
Associate Research Fellow Shaanxi Normal University graduated from Jilin University in 2003, and received his Ph. D . in physics from Jilin University in 2008. He worked at the Harbin Institute of Technology from 2008 to 2018 and did postdoctoral research at Charles Darwin University in Australia from 2012 to 2014. Joined the Shaanxi Normal University at the end of 2018. His main research areas are the precise calculation of atomic and molecular structure parameters and their applications in optical frequency standards and the verification of basic physical models , positron and atom collisions , etc ., and the problem of atomic and molecular structure and electron atom collision in plasma environment . He has hosted and participated in a number of NSFC projects . He has published more than 30 papers in Physical Review A , Astronomy & Astrophysics , Journal of Physic s B , Physics of Plasmas , Atomic Data and Nuclear Data Tables , Chinese Physics B .
Abstract :
With the rapid development of laser cooling technology , the use of optical lattices to trap cold atoms or ion traps to achieve optical frequency standards is one of the most concerned research areas in recent years , the design of related experiments and uncertainty analysis are highly dependent on the precise calculation of structural parameters . At the same time , the combination of highly accurate calculations of atomic and ionic structures with experimental measurements is currently the primary means of obtaining and verifying physical constant and fundamental physical laws . In our work in recent years , we have obtained highly accurate alkali metals by using different methods , such as polarization potential , to describe the electron correlation effect between valence electrons and atoms , on the basis of the relativistic Configuration interaction theory , the energy level structure , polarizability and magic wavelength of alkaline earth metals and other complex systems provide strong support for the design and analysis of related experiments . On this basis , we have made a detailed study of the collision between low - energy electrons and noble gas atoms by using the structure calculation program combined with the box variational method , and obtained accurate cross - section data , the existing theoretical results in small angle and large angle region and the experimental value of the obvious difference.
Report Time:7.23 (Friday) 9:00-12:00
Report Location: Life Sciences Building 504
