DNA低聚物的非谐振动动力学
Anharmonic Vibrational Dynamics of DNA Oligomers
摘要：
结合双色红外泵浦-探测光谱和非谐力场计算，我们表征了腺嘌呤-胸腺嘧啶dA $_{20}$ -dT $_{20}$ DNA寡聚体中指纹模式与氢键对称NH-$_2$伸缩振动之间的非谐耦合模式.具体而言，它示出的NH $_2$弯曲和CO伸缩振动，都吸收约1665 cm-1之间的非谐耦合，可以用来分配NH $_2$基本跃迁在3215 cm-1，尽管水的广泛的背景吸收。
英文摘要：
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.
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