Phys. Rev. Lett. 86, 2154–2157 (2001)Vibrational Anharmonicities Revealed by Coherent Two-Dimensional Infrared SpectroscopyReceived 12 October 2000; published in the issue dated 5 March 2001 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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