Photoelectron Emission from Rhodamine B Adsorbed on Various Substrates

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Abstract
The quantum yield of photoelectrons, emitted from rhodamine B layers, which were adsorbed on cleaved faces of ionic crystals and on polished faces of amorphous quartz, has served to estimate the effective densities of occupied dye states in a small energy range below the vacuum level. For NaCl(100), RbCl(100), and calcite (1010) substrates the energy distributions of these states are very similar. If the substrate is amorphous quartz, the density of dye states in the investigated energy range is negligible in comparison to that on the ionic crystals. Assumptions are made concerning the possible origin of the relatively high density of dye states generated on ionic crystals.