We present theoretical elastic and electronic excitation cross sections and experimental electronic excitation cross sections for electron collisions with pyrimidine. We use the R-matrix method to determine elastic integral and differential cross sections and integral inelastic cross sections for energies up to 15 eV. The experimental inelastic cross sections have been determined in the 15-50 eV impact energy range. Typically, there is quite reasonable agreement between the theoretical and experimental integral inelastic cross sections. Calculated elastic cross sections agree very well with prior results.

Laser photoelectron spectra have been obtained following the preparation of 10 vibrational states in S1 p-fluorotoluene. For eight of the vibrational states (up to ∼850 cm-1 excess energy), excitation and ionization with nanosecond laser pulses gives rise to photoelectron spectra with well-resolved vibrational peaks. For the other two states (>1100 cm-1 excess energy), the photoelectron spectra show a loss of structure when nanosecond pulses are used, as a result of intramolecular dynamics, but this structure is recovered when overlapped picosecond pulses are used. In all cases the vibrational peaks in the photoelectron spectra are assigned, and the spectra are used to deduce the frequencies of 12 vibrational modes in the ion.

No abstract

No abstract

No abstract