Free-electron attachment to thymine and partially deuterated thymine, where D replaces H at all carbon atoms, is studied in the electron energy range from about 0to15eV. The formation of fragment anions that are formed by the loss of one or two H (D) atoms is analyzed as a function of the incident electron energy using a crossed electron/neutral beam apparatus in combination with a quadrupole mass spectrometer. By using partially deuterated thymine and quantum-chemical calculation a bond selectivity for the loss of one and two hydrogen atoms is observed that is determined only by the kinetic energy of the incident electron.
Journal of Chemical Physics
- Pub Date:
- September 2005
- Dissociation and dissociative attachment by electron impact;
- Electron-ion recombination and electron attachment;
- Mass spectra;
- Bond strengths dissociation energies