Figure 8. Relationship between the perceived color, the wavelength and color of the absorbed light, and the energetic depression of the HOMO in ME molecules solved in ethanol, acetone and toluene; HBE (Höchste Besetzte Energiestufe is the German abbreviation for HOMO, and NUE (Niedrigste Unbesetzte Energiestufe) for LUMO [15,16]

From

Experimental Approach for Efficiency Determination of Photocatalytic Hydrogen Evolution

Philipp Lanfermann, Christoph Weidmann, Janina Dege, Steven Celik, Alexander Tasch, Mona Christin Maaß, Thomas Waitz

World Journal of Chemical Education. 2021, 9(4), 185-189 doi:10.12691/wjce-9-4-11