We present the wave number vector dependence of transmission current and noise spectra which was generated by the transition of electrons from vacuum to thin oxide films on metal electrodes. The transmission probability of an incident electron consists of three factors: (1) probability from vacuum to the surface electronic states on the oxide film; (2) probability from the oxide film to the metal substrate; and (3) probability of the direct transition from vacuum to the metal substrate. The noise spectra were proportional to the duration of the electron hopping, which contained two types of wave number dependence. One was spot-type-noises, which were related to the lattice defects, and another was smoothly distributed noise which suggested randomly distributed surface defects.