ANGLE-RESOLVED PHOTOEMISSION SPECTROSCOPY OF ULTRATHIN FILMS OF H-2-PHTHALOCYANINE ON MOS2 SURFACES

The angle-resolved ultraviolet photoelectron spectra were measured for ultrathin films of H-2-phthalocyanine deposited on cleaved MoS2 surfaces using synchrotron radiation. The take-off angle (theta) dependence of photoelectron intensity from the highest pi band showed a sharp maximum at theta=34-degrees. The observed angular distribution could be explained excellently by an angular distribution calculated for flat-lie orientation of the molecules using independent-atomic-center approximation combined with molecular orbital calculation. The results confirm that the calculation method is useful to describe photoelectron angular distribution from thin films of large and complex organic molecules and H-2-phthalocyanine molecules lie flatly on MoS2 surface.