PHYS 328 |
| Studies of water with ultrafast nonlinear infrared spectroscopy have commonly used isotopically dilute solutions, which provide a local probe of hydrogen bond dynamics. We have studied the infrared spectroscopy of tritiated water, as a step toward probing hydrogen bond switching with correlation spectroscopy between the OD and OT stretching vibrations in H2O. We report on the infrared absorption spectrum and femtosecond infrared pump-probe spectroscopy of the OT stretching vibration of HOT in H2O. We compare IR absorption line shape parameters between the three isotopes (OH:OD:OT), discussing deviations from harmonic scaling relationships in terms of electrical and mechanical anharmonicity. Comparison of the lifetimes between the three isotopes, obtained from pump-probe experiments, gives valuable information on the vibrational relaxation pathways in water. |
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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
Division of Physical Chemistry |