PHYS 330 |
| Recently proposed relaxation-assisted 2DIR (RA 2DIR) spectroscopy method is applied to several molecular systems. We demonstrate that RA 2DIR is capable of detecting bond connectivity patterns in molecules using two parameters, a characteristic intermode energy transport time, arrival time, and a cross-peak amplification coefficient. For many localized modes the arrival time is shown to correlate with the intermode distance in rigid molecules, such as 4-(4-oxo-piperidine-1-carbonyl)-benzonitrile. For some less localized modes, the correlation of the arrival time with the intermode distance is more complex; the RA 2DIR method provides a measure of the mode delocalization. The observed correlation between the arrival time and distance shows that the relaxation and intermolecular vibrational energy redistribution processes occur between partially overlapping and largely localized modes. With the known correlation of the arrival time with distance, experimentally recorded arrival times report directly on intermode distances, demonstrating the analytical power of RA 2DIR.
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PHYS Poster Session - Optical Probes of Dynamics in Complex Environments
7:30 PM-10:00 PM, Wednesday, April 9, 2008 Morial Convention Center -- Hall A, Poster
Sci-Mix
Division of Physical Chemistry |
