Anharmonic Vibrational Dynamics of DNA Oligomers

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 NH\(_2\) stretching vibration in adenine-thymine dA\(_{20}\)-dT\(_{20}\) DNA oligomers. Specificall...

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Bibliographic Details
Published in:arXiv.org 2008-12
Main Authors: Kühn, O, Došlić, N, Krishnan, G M, Fidder, H, Heyne, K
Format: Article
Language:English
Subjects:
Absorption
Anharmonicity
Coupling
Deoxyribonucleic acid
DNA
Hydrogen bonding
Oligomers
Stretching
Thymine
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Summary: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 NH\(_2\) stretching vibration in adenine-thymine dA\(_{20}\)-dT\(_{20}\) DNA oligomers. Specifically, it is shown that the anharmonic coupling between the NH\(_2\) bending and the CO stretching vibration, both absorbing around 1665 cm-1, can be used to assign the NH\(_2\) fundamental transition at 3215 cm-1 despite the broad background absorption of water.
ISSN:2331-8422
DOI:10.48550/arxiv.0812.3335