Temperature and Coverage Dependent Quasi-reversible Two-photon Photoemission of 1-phenyl-1-propyne on Cu(111)

Title
Temperature and Coverage Dependent Quasi-reversible Two-photon Photoemission of 1-phenyl-1-propyne on Cu(111)
Author(s)
손영구웨이 웨이[웨이 웨이]웨이신 후앙[웨이신 후앙]죤마이크 화이트[죤마이크 화이트]
Keywords
MOLECULE-METAL INTERFACES; IMAGE-POTENTIAL STATES; FEMTOSECOND DYNAMICS; ELECTRONIC-STRUCTURE; SPECTROSCOPY; OVERLAYER; SURFACES; 2PPE
Issue Date
201106
Publisher
KOREAN CHEMICAL SOC
Citation
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.32, no.6, pp.1980 - 1984
Abstract
A temperature- and coverage-dependant quasi-reversible change in two-photon photoemission (2PPE) of chemisorbed 1-phenyl-1-propyne (PP) on Cu(111) is reported. For PP on Cu(111) at 300 K probed at a photon energy of 4.13 eV, two broad peaks of comparable intensity show final state energies of 7.25 and 7.75 eV above the Fermi level. The former peak could be assigned to the first image potential state (IS, n = 1) and/or unoccupied molecular orbital (UMO), located at 3.1 eV above the Fermi level. The latter is plausibly attributed to a mix of unoccupied higher-order IS (and/or UMO) and occupied surface state (SS) of Cu(111). With decreasing the temperature, the former 2PPE peak shows a shift in position by about 0.2 eV, and the latter exhibits a dramatic increase in intensity. In the system, intermolecular interactions (and/or order-disorder transition) of PP and substrate lattice temperature may play a significant role in change in photoexcitation lifetime (or excitation cross-section), and the unoccupied molecular orbital (UMO)-metal (IS) charge transfer coupling. Our unique 2PPE results provide a deeper insight for understanding photoexcitation charge transfer with temperature in an organic molecule/metal system.
URI
http://hdl.handle.net/YU.REPOSITORY/25061http://dx.doi.org/10.5012/bkcs.2011.32.6.1980
ISSN
0253-2964
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이과대학 > 화학생화학부 > Articles
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