Anharmonic Vibrational Dynamics of DNA Oligomers
Abstract
Combining two-color infared pump-probe spectroscopy and anharmonic force field calculations we characterize the anharmonic coupling patterns between fingerprint modes and the hydrogen-bonded symmetric NH2 stretching vibration in adenine-thymine dA20-dT20 DNA oligomers. Specifically, it is shown that the anharmonic coupling between the NH2 bending and the CO stretching vibration, both absorbing around 1665 cm-1, can be used to assign the NH2 fundamental transition at 3215 cm-1 despite the broad background absorption of water.
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