Photoelectron spectroscopy of isolated multiply negatively charged oligonucleotides.
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.
Weber
J Mathias
JM
Institut für Physikalische Chemie, Universität Karlsruhe, Kaiserstr. 12, D-76128 Karlsruhe, Germany. jmathias.weber@chemie.uni-karlsruhe.de
Ioffe
Ilya N
IN
Berndt
Katerina M
KM
Löffler
Daniel
D
Friedrich
Jochen
J
Ehrler
Oli T
OT
Danell
Allison S
AS
Parks
Joel H
JH
Kappes
Manfred M
MM
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
D000838:Anions; D009841:Oligonucleotides; D011061:Poly A; D011071:Poly T; D004247:DNA