Photoemission from valence bands of transition metal-phthalocyanines

▶ The HOMO mainly comes from the carbon atoms of Pc rings and the central metal atoms almost have no contribution on the highest occupied molecular orbital (HOMO: a1u) distribution of CoPc as well as NiPc. ▶ Influence by central metal atom on the photoemission intensities from the HOMO of two single molecule systems is negligible for the major. ▶ The modification of the distribution for π-orbital upon adsorption as well as the scattering effects of the central metal on the photoemission intensities are negligible for the major.