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. C 2015 AIP Publishing LLC. [http://dx

Electron–ion coincidence spectroscopy of a large organic molecule: photofragmentation of avobenzone after valence and core ionisation

“…There is a contribution from false coincidences to these islands, but the unclear slope patterns are mostly due to release of neutral fragments decreasing the momentum correlation between the two ions. This was already observed for thymidine [6] and uridine [55]. Most of the islands in the PEPIPICO maps after C1s ionisation are due to many-body dissociation processes.…”