From Cold to Ultracold, What Can We Learn from Molecular Collisions?
Department of Chemistry and Chemical Biology, University of New Mexico
Meeting Room B1301, Teaching and Research Building of Material Science(remote)
Zoom Meeting ID：959-1501-1541；Passcode：494534
Hefei National Laboratory for Physical Sciences at the Microscale，International Center for Chemical Theory (ICCT)
Abstract:Molecular interactions and dynamics under cold and ultracold conditions have not only fundamental importance, but also critical technological implications. Recent advances in experimental techniques have enabled such investigations in temperature ranging from a few Kelvin (cold) to nano-Kelvin (ultracold). At these temperatures, quantum mechanics often dominates, precluding a classical description of the collision dynamics. Our understanding of molecular interactions has been transformed by these recent advances in cold and ultracold collisions. In this talk, I will discuss theoretical studies of the ultracold (~250 nK) reaction between two KRb molecules1-3 and the stereodynamics in collisions between two hydrogen molecules (and their isotopomers) at collision temperatures near 1 K.4-6
(1) Liu, Y.; Hu, M.-G.; Nichols, M. A.; Grimes, D. D.; Karman, T.; Guo, H.; Ni, K.-K. Nat. Phys. 2020, 16, 1132–1136.
(2) Liu, Y.; Hu, M.-G.; Nichols, M. A.; Yang, D.; Xie, D.; Guo, H.; Ni, K.-K. Nature 2021, 593, 379-384.
(3) Yang, D.; Huang, J.; Hu, X.; Xie, D.; Guo, H. J. Chem. Phys. 2020, 152, 241103.
(4) Croft, J. F. E.; Balakrishnan, N.; Huang, M.; Guo, H. Phys. Rev. Lett. 2018, 121, 113401.
(5) Jambrina, P. G.; Croft, J. F. E.; Guo, H.; Brouard, M.; Balakrishnan, N.; Aoiz, F. J. Phys. Rev. Lett. 2019, 123, 043401.
(6) Zuo, J.; Croft, J. F. E.; Yao, Q.; Balakrishnan, N.; Guo, H. J. Chem. Theo. Comput. 2021, 17, 6747-6756.
About the speaker:Prof. Hua Guo received his Bachelor degree from Chengdu Institute of Electronic Engineering in 1982, Master degree from Sichuan University in 1985 and PhD at University of Sussex in 1988 with John Murrell. After working with Prof. G. Schatz as a Postdoctoral Fellow from 1988-1990, he became an Assistant Professor at University of Toledo where he was promoted to Associate Professor since 1995. In 1998, he moved to University of New Mexico and became a full Professor since 2001. He was honored as Distinguished Professor (since 2015), elected to American Physical Society (APS) Fellow (2013) and fellow of American Association for the Advancement of Science (2021), and received Humboldt Research Award (2019). Prof. Guo has published over 600 publications, including Nature (1), Science (7), Nat. Chem. (5), Nat. Phys. (1), Nat. Cat. (1), Sci. Adv. (4), Nat. Commun. (3) and many more, with ~22000 citations and H-index of 74. His interests cover a wide range of theoretical and computational studies of Astrochemistry, Atmospheric Chemistry, Combustion Chemistry, Plasma Chemistry, Cold Collisions, Heterogeneous Catalysis and Materials Chemistry.