Investigating ultraviolet photoelectron spectroscopy of ice

Photoelectron energy distribution curves (EDCs) from ice excited by HeI (21.2 eV) and NeI (16.8 eV) radiation are presented. The strict connection between valence density of states and EDCs forces to rule out the previous suggestion by Shibaguchi et al. that conduction band density of states is of paramount importance in determining the EDCs excited by ultraviolet light. The results also allow a discussion of band calculations published till now; the need for a theoretical investigation on photoemission from ice is put forward.