ZEKE PFI spectroscopy of naphthalene vapors via S2 electronic state

摘要

Abstract: A new group of electrons in the naphthalene ZEKE PFI spectrum has been observed in the energy range 70000 - 72000 cm$+$MIN@1$/ by the one-color two-step laser excitation technique. It can be assigned to the field ionization of the high n Rydberg states converging to the first electron-excited ionic state of naphthalene. The lifetimes of the superexcited Rydberg states with the energy excess (above the first ionization energy) up to 1 eV are about 1 microsecond. The improved value of the second adiabatic ionization potential is 71823 plus or minus 30 cm$+$MIN@1$/ (8.904 plus or minus 0.004 eV). !19