Photoelectron spectroscopy of isolated multiply negatively charged oligonucleotides |
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| Authors: | Weber J Mathias Ioffe Ilya N Berndt Katerina M Löffler Daniel Friedrich Jochen Ehrler Oli T Danell Allison S Parks Joel H Kappes Manfred M |
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| Affiliation: | Institut für Physikalische Chemie, Universit?t Karlsruhe, Kaiserstr. 12, D-76128 Karlsruhe, Germany. jmathias.weber@chemie.uni-karlsruhe.de |
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| Abstract: | Ultraviolet photoelectron spectroscopy in an ion beam was used to investigate the electronic properties of isolated DNA oligonucleotides [dA(5)-4H](4-) and [dT(5)-4H](4-), carrying four excess negative charges. We find the fourth adiabatic electron affinity to be slightly negative for [dA(5)-4H](4-), while it is positive for [dT(5)-4H](4-). This implies a significant influence of the base composition on energetics, which is in turn relevant for analytic applications and also for charge transport properties. |
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