4 May 2007 THz and far-IR vibrational spectrum of DNA nucleotides bonded to Si substrates
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A study of the vibration characteristics of a deoxyguanosine molecule and a deoxyadenosine molecule bonded onto the surface of silicon is presented. The vibrations of the systems can be classified into five modes: nonlocal vibrational modes, local vibrational modes, quasi-local modes, backbone vibrational modes and molecular bond vibrational modes. The general separation of the molecular bond modes (i.e., which occur in the infrared region) and other vibrational modes (i.e., which occur in the far-infrared (Far-IR) region) is only weakly influenced by mounting the molecules onto the surface of silicon through linker molecules. The main influence of the binding of the molecule onto to the surface of a silicon substrate is the shifting of the vibrational modes towards the terahertz regime (i.e., ~ 100 cm-1) and an associated increase of the number of these low frequency modes. Furthermore, the FAR-IR active vibrational regions (i.e., defined where there exists the strongest absorption peaks) are in the range of 300 cm-1 to 1903 cm-1 for a deoxyguanosine molecule and 500 cm-1 to 1841 cm-1 for a deoxyadenosine molecule, respectively. For frequencies below these Far-IR regions, the absorption intensity is small. However, the vibrations in this region are almost all nonlocal vibration modes which are important for the study of interaction between bases and for the development of sequence information of DNA molecules in terms of optical techniques.
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Brandee Woolard, Brandee Woolard, Peiji Zhao, Peiji Zhao, } "THz and far-IR vibrational spectrum of DNA nucleotides bonded to Si substrates", Proc. SPIE 6549, Terahertz for Military and Security Applications V, 65490H (4 May 2007); doi: 10.1117/12.723689; https://doi.org/10.1117/12.723689

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