Journal
PHYSICAL REVIEW B
Volume 75, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.75.121305
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We demonstrate spectroscopic evidence of 2t level splitting of the highest occupied molecular orbital (HOMO) state, which is characterized by twice the intermolecular transfer integral t, with ultraviolet photoelectron spectroscopy in a well-ordered bilayer of lead-phthalocyanine deposited on graphite. The HOMO state splits clearly by 2t=0.35 eV upon bilayer formation at 295 K and the splitting increases to 0.41 eV at 47 K. The splitting is ascribed to dimer nanostructures with antiparallel molecular electric dipoles.
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