title: Gas-phase study on uridine: Conformation and X-ray photofragmentation.
abstract: Fragmentation of RNA nucleoside uridine, induced by carbon 1s core ionization, has been studied. The measurements by combined electron and ion spectroscopy have been performed in gas phase utilizing synchrotron radiation. As uridine is a combination of d-ribose and uracil, which have been studied earlier with the same method, this study also considers the effect of chemical environment and the relevant functional groups. Furthermore, since in core ionization the initial core hole is always highly localized, charge migration prior to fragmentation has been studied here. This study also demonstrates the destructive nature of core ionization as in most cases the C 1s ionization of uridine leads to concerted explosions producing only small fragments with masses ≤43 amu. In addition to fragmentation patterns, we found out that upon evaporation the sugar part of the uridine molecule attains hexagonal form.
authors.affiliation: Department of Physics and Astronomy, University of Turku, FIN-20014 Turku, Finland.
authors.forename: Eero
authors.initials: E
authors.lastname: Itälä
authors.affiliation: Department of Physics and Astronomy, University of Turku, FIN-20014 Turku, Finland.
authors.forename: Kuno
authors.initials: K
authors.lastname: Kooser
authors.affiliation: Royal Institute of Technology KTH, Physics department, S-10691 Stockholm, Sweden.
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Rachlew
authors.affiliation: Department of Physics and Astronomy, University of Turku, FIN-20014 Turku, Finland.
authors.forename: Helena
authors.initials: H
authors.lastname: Levola
authors.affiliation: Department of Physics and Astronomy, University of Turku, FIN-20014 Turku, Finland.
authors.forename: Dang Trinh
authors.initials: DT
authors.lastname: Ha
authors.affiliation: Department of Physics and Astronomy, University of Turku, FIN-20014 Turku, Finland.
authors.forename: Edwin
authors.initials: E
authors.lastname: Kukk
mesh_terms: D005740:Gases / Q000737:chemistry / Q000528:radiation effects; D008968:Molecular Conformation / Q000528:radiation effects; D010782:Photolysis / Q000528:radiation effects*; D013057:Spectrum Analysis; D014529:Uridine / Q000737:chemistry* / Q000528:radiation effects*; D014965:X-Rays
chemical_list: D005740:Gases; D014529:Uridine