Jinjun Liu

Associate Professor

About

The Liu Research Group Websites

UofL Site

Google Site

Research Interests
Research in the Liu Group consists of spectroscopic studies on gas-phase molecules and condensed-phase materials in both frequency domain (using high-resolution laser systems) and time domain (using ultrafast laser systems). Our high-resolution studies center on the spectroscopic detection and characterization of reactive chemical intermediates, e.g., free radicals and molecules in excited electronic states. These studies lead to a detailed understanding of molecular structures and dynamics and the nature of chemical bonding. Unambiguous identification and analysis of the experimentally obtained spectra is a prerequisite to subsequent work on the chemical reactions that involve these intermediates. We are particularly interested in molecular species with Jahn-Teller effect and pseudo-Jahn-Teller effect, and vibronic (vibrational-electronic) interactions that cause spontaneous distortion of the symmetry of polyatomic molecules. Quantum chemistry calculations are used to help understand these molecules. 

The goal of the ultrafast spectroscopy study in the Liu Group, which is carried out in the Ultrafast Laser Facility in the Conn Center for Renewable Energy Research, is to contribute to the advancement of renewable energy science and technology through basic spectroscopic studies. Currently, our research efforts are focused on the characterization of solar cell materials and understanding the fundamental photoinduced processes in the materials and their interfaces, which are essential to their functions and applications. 

Funding

"Laser Spectroscopic Investigation of Vibronic Interactions in Free Radicals and Molecular Complexes", NSF CAREER, CHE-1454825, 08/01/2015-07/31/2020. 

"Looking for Molecular Funnels: Spectroscopy and Dynamics Beyond the Born-Oppenheimer Approximation", Kentucky Science and Engineering Foundation (KSEF) - the Research and Development Excellence Program (RDE), KSEF-3244-RDE-018, 07/01/2015-06/30/2016. 

“Spectroscopic Investigation of Vibronic Interactions in Molecules with Low Symmetry”, American Chemical Society (ACS) - Petroleum Research Fund (PRF) - Doctoral New Investigator Program, 53476-DNI6, 09/01/2013-08/31/2015. 

“Nanoscale Materials and Architectures for Energy Conversion”, DOE-EPSCoR, DE-FG02-07ER46375, 07/01/2011—06/30/2014. 

Agilent Technologies Foundation - Applications and Core Technology University Research Grant, ACT-UR, 2011.