Abstract
We characterize diagonal and off-diagonal anharmonicities of N-H stretching vibrations in adenosine and thymidine monomers and in A•T-base pairs in chloroform solution, showing the important role of coupling between vibrationally excited N-H stretching states.
Highlights
We have assigned the N-H stretching bands of G C base pairs observed in the linear FT-IR spectrum using a local mode picture, and elucidated the diagonal and off-diagonal cross peaks measured with femtosecond 2D-IR photon echo spectroscopy [4]
Using the same approach we present here new results on adenosinethymidine (A T) base pairs, chemically modified in the same way as G and C, dissolved in chloroform
To obtain a general understanding of the linear and nonlinear spectroscopy of the N-H stretching manifolds of different complexation geometries of A T, we first explore the nonlinear response of N-H stretching modes of A and T monomers
Summary
We characterize diagonal and off-diagonal anharmonicities of N-H stretching vibrations in adenosine and thymidine monomers and in A T-base pairs in chloroform solution, showing the important role of coupling between vibrationally excited N-H stretching states. We have assigned the N-H stretching bands of G C base pairs observed in the linear FT-IR spectrum using a local mode picture, and elucidated the diagonal and off-diagonal cross peaks measured with femtosecond 2D-IR photon echo spectroscopy [4]. To obtain a general understanding of the linear and nonlinear spectroscopy of the N-H stretching manifolds of different complexation geometries of A T, we first explore the nonlinear response of N-H stretching modes of A and T monomers.
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