Electronic structure of adenine and thymine base pairs studied by femtosecond electron-ion coincidence spectroscopy

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DOIResolve DOI: http://doi.org/10.1021/jp076800e
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TypeArticle
Journal titleThe Journal of Physical Chemistry A
ISSN1089-5639
Volume111
Issue46
Pages1174311749; # of pages: 7
AbstractFemtosecond pump−probe spectroscopy was combined with photoelectron−photoion coincidence detection to investigate the electronic structure and dynamics of isolated adenine (A) and thymine (T) dimers and the adenine−thymine (AT) base pair. The photoelectron spectra show that ππ* and nπ* states are only weakly perturbed in the hydrogen-bound dimers as compared to the monomers. For cationic base pairs with internal energies greater than 1 eV, we observed considerable cluster fragmentation into protonated monomers. This process selectively removed signals from the nπ* → n-¹ ionization channel in all dimers. The photoelectron spectra are compared to time-resolved mass spectra and confirm the assignment of short-lived ππ* and nπ* populations in the adenine, thymine, and mixed AT dimers.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedYes
NPARC number12327917
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Record identifierdb4ea838-d64b-464c-aa0b-a7edab815e24
Record created2009-09-10
Record modified2017-03-23
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