Photoelectron spectroscopy of pyridine cluster anions, (Py) n - (n=4-13)

摘要: Photoelectron spectroscopy was carried out for mass-selected anion clusters of pyridine (C5H5N=Py) up to (Py)13−. The smallest cluster observed (Py)4−, which exhibited two distinctly different photoelectron bands arising from dipole-bound and valence electron states. A mixed [(Py)3(H2O)1]− displayed similar features. No state in the larger neat pyridine, (Py)5–13−, were interpreted as solvated molecular anion, Py−(Py)4–12. Threshold binding energies measured upper limit value adiabatic affinities. They increased monotonically 0.33 eV size n=4 1.02 eV n=13. But their incremental change showed a large drop at n=8, did vertical detachment energy, viewed due completion first solvation shell n=7. energetics suggested nearly pure electrostatic interactions play. boundary dra...