Open AccessAngle‐resolved UV photoelectron spectra (UPS) of thin films of perylene‐3,4,9,10‐tetracarboxylic dianhydride on MoS 2
Author(s) -
Azuma Yasushi,
Hasebe Takehiko,
Miyamae Takayuki,
Okudaira Koji K.,
Harada Yoshiya,
Seki Kazuhiko,
Morikawa Eizi,
Saile Volker,
Ueno Nobuo
Publication year - 1998
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049597016877
Subject(s) - perylene , spectral line , x ray photoelectron spectroscopy , substrate (aquarium) , chemistry , molecule , thin film , binding energy , analytical chemistry (journal) , angle resolved photoemission spectroscopy , materials science , crystallography , atomic physics , electronic structure , computational chemistry , physics , nuclear magnetic resonance , nanotechnology , organic chemistry , astronomy , oceanography , geology
Angle‐resolved UV photoelectron spectra (ARUPS) were measured for thin films of perylene‐3,4,9,10‐tetracarboxylic dianhydride (PTCDA) deposited on cleaved MoS 2 surfaces. The take‐off angle (θ) dependence of the photoelectron intensity of the highest π band showed a sharp maximum at θ = 32–34°. A spectral feature of the binding energy at ∼8.9 eV, which is believed to originate from a π state, showed a remarkably different θ dependence from that of the π band. A quantitative analysis of the observed θ dependencies clearly indicates that ( a ) the feature at ∼8.9 eV originates from the oxygen 2 p non‐bonding states and ( b ) the molecules lie flat on the substrate surface.