Observing ultrafast molecular motion using 2DIR Spectroscopy

Kiran Sankar Maiti, Department of Chemistry and Molecular Biology, University of Gothenburg (Sweden)

2D-IR spectra of 2-Pyrrolidinone in CCl4

Abstract

Last couple of decades there have been a significant technological development of laser science and spectroscopy. Specially generation and control over the femtosecond infrared pulse per- mits us to visualize the time-dependent structural changes of fundamental physical processes in complex material and biological system. One of these development is two-dimensional infrared (2DIR) vibrational echo spectroscopy which has essentially sufficient time resolution to observe the structure and dynamics of proteins and peptides. Mainly three sequence of ultrafast pulses with phase match conditions are employed experimentally. Depending upon the sequence and data collection, the technique varies and named differently, but the 2DIR spectra looks same. The structural information is typically present in terms of the position, strength, and shape of the off-diagonal cross-peaks in the 2D spectrum. These are directly related to the anharmonic vibrational structure of the molecule. A detail understanding of the experimental spectra re- quire more theoretical and computational support. I will emphasize on both theoretical and experimental aspect of 2DIR spectroscopy. 

Published July 22, 2012 8:09 PM - Last modified July 22, 2012 8:09 PM