Anthraquinone self-assembles on Cu(111) into a giant honeycomb network with exactly three molecul... more Anthraquinone self-assembles on Cu(111) into a giant honeycomb network with exactly three molecules on each side. Here we propose that the exceptional degree of order achieved in this system can be explained as a consequence of the confinement of substrate electrons in the pores, with the pore size tailored so that the confined electrons can adopt a noble-gas-like two-dimensional quasi-atom configuration with two filled shells. Formation of identical pores in a related adsorption system (at different overall periodicity due to the different molecule size) corroborates this concept. A combination of photoemission spectroscopy with density functional theory computations (including van der Waals interactions) of adsorbate-substrate interactions allows quantum mechanical modeling of the spectra of the resultant quasi-atoms and their energetics.
... T.-M. Chuang, MP Allan, Jinho Lee, Yang Xie, Ni Ni, SL Bud&am... more ... T.-M. Chuang, MP Allan, Jinho Lee, Yang Xie, Ni Ni, SL Bud'ko, GS Boebinger, PC Canfield, and JC Davis, Science ... CaFe2As2 undergo a tetragonal to orthorhombic structural transition simultaneously with a paramagnetic to antiferromagnetic transition below TS Ó TN Ó 130 ...
Journal of Electron Spectroscopy and Related Phenomena, 2001
We have applied a new differential method of photoelectron holography to both experimental and th... more We have applied a new differential method of photoelectron holography to both experimental and theoretical multiple-energy photoelectron diffraction data for Cu 3p bulk emission from Cu(001). Dominant forward-scattering effects contained in a normalized hologram χk have been eliminated by taking the k-difference δχk along each direction k̂. Two data sets that are different in k-space sampling ranges and densities have
The Energy Citations Database (ECD) provides access to historical and current research (1948 to t... more The Energy Citations Database (ECD) provides access to historical and current research (1948 to the present) from the Department of Energy (DOE) and predecessor agencies.
Detailed angle-resolved photoemission studies of Tb and Dy metal in the paramagnetic phase provid... more Detailed angle-resolved photoemission studies of Tb and Dy metal in the paramagnetic phase provide direct experimental proof of the presence of nesting features in the Fermi surfaces (FS) of these heavy lanthanide (Ln) metals. The observations clearly support the hypothesis that nesting of the FS in the paramagnetic phase is responsible for the development of helical antiferromagnetic ordering in heavy Ln metals. They also show that magnetic exchange splitting of the electronic states is responsible for the disappearance of FS nesting in the ferromagnetic phases.
... BJ Kim 1 , H. Koh 2 , E. Rotenberg 2 , S.-J. Oh 1 , H. Eisaki 3 , N. Motoyama 4 , S. Uchida 4... more ... BJ Kim 1 , H. Koh 2 , E. Rotenberg 2 , S.-J. Oh 1 , H. Eisaki 3 , N. Motoyama 4 , S. Uchida 4 , T. Tohyama 5 , S. Maekawa 5, 6 , Z.-X. Shen 7 & C. Kim 8. Abstract. ... Figure 2: Crystal structure, cleavage plane and relevant orbitals. ...
The local adsorption structure of oxygen on Cu(1 0 0) has been studied using O 1s scanned-energy ... more The local adsorption structure of oxygen on Cu(1 0 0) has been studied using O 1s scanned-energy mode photoelectron diffraction. A detailed quantitative determination of the structure of the 0.5 ML (√2×2√2)R45°-O ordered phase confirms the missing-row ...
We report the first kinematically complete measurements of the four-body fragmentation of the D2 ... more We report the first kinematically complete measurements of the four-body fragmentation of the D2 molecule following absorption of a single photon. For two equal energy electrons and a photon energy of 75.5 eV, we observe the relaxation of one selection rule valid for He photo double ionization and a strong dependence of the electron angular distribution on the orientation of the molecular axis. The results also reveal that the electron motion is strongly dependent on the inter-nuclear separation at the instant of photon absorption. Many of the observations are reproduced by a model utilizing different photo-ionization amplitudes for light polarization parallel and perpendicular to the molecular axis, a single center model for the molecular initial state and a convergent close coupling continuum final state.
Anthraquinone self-assembles on Cu(111) into a giant honeycomb network with exactly three molecul... more Anthraquinone self-assembles on Cu(111) into a giant honeycomb network with exactly three molecules on each side. Here we propose that the exceptional degree of order achieved in this system can be explained as a consequence of the confinement of substrate electrons in the pores, with the pore size tailored so that the confined electrons can adopt a noble-gas-like two-dimensional quasi-atom configuration with two filled shells. Formation of identical pores in a related adsorption system (at different overall periodicity due to the different molecule size) corroborates this concept. A combination of photoemission spectroscopy with density functional theory computations (including van der Waals interactions) of adsorbate-substrate interactions allows quantum mechanical modeling of the spectra of the resultant quasi-atoms and their energetics.
... T.-M. Chuang, MP Allan, Jinho Lee, Yang Xie, Ni Ni, SL Bud&am... more ... T.-M. Chuang, MP Allan, Jinho Lee, Yang Xie, Ni Ni, SL Bud'ko, GS Boebinger, PC Canfield, and JC Davis, Science ... CaFe2As2 undergo a tetragonal to orthorhombic structural transition simultaneously with a paramagnetic to antiferromagnetic transition below TS Ó TN Ó 130 ...
Journal of Electron Spectroscopy and Related Phenomena, 2001
We have applied a new differential method of photoelectron holography to both experimental and th... more We have applied a new differential method of photoelectron holography to both experimental and theoretical multiple-energy photoelectron diffraction data for Cu 3p bulk emission from Cu(001). Dominant forward-scattering effects contained in a normalized hologram χk have been eliminated by taking the k-difference δχk along each direction k̂. Two data sets that are different in k-space sampling ranges and densities have
The Energy Citations Database (ECD) provides access to historical and current research (1948 to t... more The Energy Citations Database (ECD) provides access to historical and current research (1948 to the present) from the Department of Energy (DOE) and predecessor agencies.
Detailed angle-resolved photoemission studies of Tb and Dy metal in the paramagnetic phase provid... more Detailed angle-resolved photoemission studies of Tb and Dy metal in the paramagnetic phase provide direct experimental proof of the presence of nesting features in the Fermi surfaces (FS) of these heavy lanthanide (Ln) metals. The observations clearly support the hypothesis that nesting of the FS in the paramagnetic phase is responsible for the development of helical antiferromagnetic ordering in heavy Ln metals. They also show that magnetic exchange splitting of the electronic states is responsible for the disappearance of FS nesting in the ferromagnetic phases.
... BJ Kim 1 , H. Koh 2 , E. Rotenberg 2 , S.-J. Oh 1 , H. Eisaki 3 , N. Motoyama 4 , S. Uchida 4... more ... BJ Kim 1 , H. Koh 2 , E. Rotenberg 2 , S.-J. Oh 1 , H. Eisaki 3 , N. Motoyama 4 , S. Uchida 4 , T. Tohyama 5 , S. Maekawa 5, 6 , Z.-X. Shen 7 & C. Kim 8. Abstract. ... Figure 2: Crystal structure, cleavage plane and relevant orbitals. ...
The local adsorption structure of oxygen on Cu(1 0 0) has been studied using O 1s scanned-energy ... more The local adsorption structure of oxygen on Cu(1 0 0) has been studied using O 1s scanned-energy mode photoelectron diffraction. A detailed quantitative determination of the structure of the 0.5 ML (√2×2√2)R45°-O ordered phase confirms the missing-row ...
We report the first kinematically complete measurements of the four-body fragmentation of the D2 ... more We report the first kinematically complete measurements of the four-body fragmentation of the D2 molecule following absorption of a single photon. For two equal energy electrons and a photon energy of 75.5 eV, we observe the relaxation of one selection rule valid for He photo double ionization and a strong dependence of the electron angular distribution on the orientation of the molecular axis. The results also reveal that the electron motion is strongly dependent on the inter-nuclear separation at the instant of photon absorption. Many of the observations are reproduced by a model utilizing different photo-ionization amplitudes for light polarization parallel and perpendicular to the molecular axis, a single center model for the molecular initial state and a convergent close coupling continuum final state.
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