Valence and Dipole Binding of Electrons to Uracil

Rydberg electron attachment to gas-phase isolated uracil molecules and mixed uracil−argon clusters is examined in a crossing beam experiment. By means of reproducible uracil beam conditions, it is possible to control the electron-binding process, which is strongly influenced by solvation. Attachment...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 1998-02, Vol.102 (8), p.1274-1278
Main Authors: Desfrançois, C, Periquet, V, Bouteiller, Y, Schermann, J. P
Format: Article
Language:English
Subjects:
Aromatic hydrocarbons
Band structure
Binding energy
Electron transport properties
RNA
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Summary:Rydberg electron attachment to gas-phase isolated uracil molecules and mixed uracil−argon clusters is examined in a crossing beam experiment. By means of reproducible uracil beam conditions, it is possible to control the electron-binding process, which is strongly influenced by solvation. Attachment followed by evaporation of a single argon atom is already sufficient to switch from dipole-bound to valence monomer uracil anions, as demonstrated by field-detachment measurements. The existence of both types of anions is in good agreement with two separate previous theoretical predictions. A DFT calculation of the valence adiabatic electron affinity of uracil provides a small but positive value of 70 meV, close to the measured value of the dipole-bound electron affinity.
ISSN:1089-5639
1520-5215
DOI:10.1021/jp9728417