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Phys. Rev. Lett. 86, 2154 - 2157 (2001)

Vibrational Anharmonicities Revealed by Coherent Two-Dimensional Infrared Spectroscopy

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O. Golonzka, M. Khalil, N. Demirdöven, and A. Tokmakoff
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

Received 12 October 2000

Two-dimensional infrared photon echo spectroscopy has been used to describe the anharmonic nuclear potential of two coupled molecular vibrations. The two-dimensional spectrum shows diagonal and off-diagonal features, each composed of two peaks. The splitting between these peaks is directly related to the anharmonicity, while the relative amplitude of the diagonal and off-diagonal features describes the projection angle between interacting dipoles.


©2001 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.86.2154
DOI: 10.1103/PhysRevLett.86.2154
PACS: 78.47.+p, 42.50.Md, 82.20.Rp

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