Comment on "Phase transformation on and charged particle emission from a Si crystal surface induced by ps laser pulses"

Abstract

The electron and positive ion emissions observed in the work cited are noted to be inconsistent with the Saha-Langmuir equation. Moreover, the observed exponential dependence of ion yield on incident laser energy is shown to be inconsistent with thermal evaporation in either the low or the high fluence regime. It is suggested that the most likely cause of this ion emission is multiple-photo-ion emission.