title: Photoelectron spectroscopy of isolated multiply negatively charged oligonucleotides.
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.
authors.affiliation: Institut für Physikalische Chemie, Universität Karlsruhe, Kaiserstr. 12, D-76128 Karlsruhe, Germany. jmathias.weber@chemie.uni-karlsruhe.de
authors.forename: J Mathias
authors.initials: JM
authors.lastname: Weber
authors.forename: Ilya N
authors.initials: IN
authors.lastname: Ioffe
authors.forename: Katerina M
authors.initials: KM
authors.lastname: Berndt
authors.forename: Daniel
authors.initials: D
authors.lastname: Löffler
authors.forename: Jochen
authors.initials: J
authors.lastname: Friedrich
authors.forename: Oli T
authors.initials: OT
authors.lastname: Ehrler
authors.forename: Allison S
authors.initials: AS
authors.lastname: Danell
authors.forename: Joel H
authors.initials: JH
authors.lastname: Parks
authors.forename: Manfred M
authors.initials: MM
authors.lastname: Kappes
mesh_terms: D000838:Anions; D004247:DNA / Q000737:chemistry*; D013058:Mass Spectrometry; D008956:Models, Chemical; D009841:Oligonucleotides / Q000737:chemistry*; D011061:Poly A / Q000737:chemistry*; D011071:Poly T / Q000737:chemistry*; D013057:Spectrum Analysis / Q000379:methods; D013696:Temperature; D013816:Thermodynamics
chemical_list: D000838:Anions; D009841:Oligonucleotides; D011061:Poly A; D011071:Poly T; D004247:DNA