Valence-band structures of phosphorus allotropes II

Densities-of-states calculations are reported for the phosphorus allotrope known as Hittorf's phosphorus, and for two closely related compounds, KP₁₅ and BaP₁₀; all three contain pentagonal tubes of covalently bonded phosphorus atoms. The experimental photoelectron energy distribution curves from amorphous red phosphorus suggest that these tubes could be the dominant structural unit there also.