| 1. |
- AGREN, H, et al.
(författare)
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SYMMETRY SELECTIVE RESONANT INELASTIC X-RAY-SCATTERING
- 1995
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Ingår i: PHYSICA B. - : ELSEVIER SCIENCE BV. - 0921-4526. ; 209:1-4, s. 105-107
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We use two species with high point group symmetry, fullerene and benzene, to discuss important features of symmetry selective resonant inelastic X-ray scattering spectroscopy.
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| 3. |
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| 4. |
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| 5. |
- Guo, J.-H., et al.
(författare)
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How the phenyle rings (benzene) act as building blocks in pi conjugated polymers
- 1998
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Ingår i: Advanced Light Source. - Berkeley : Ernest Orlando Lawrence Berkeley National Laboratory, University of California Berkeley, California, USA. ; , s. 129-132
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Organic conjugated polymers have the electronic structure of semiconductors and can be doped to become good conductors (1). Conjugated polymers are now used as active materials in a wide variety of prototype applications such as light emitting diodes [2] and organic transistors [3,4]. Most of the interesting chemistry and physics of conjugated polymers is associated with the details of the electronic structure at the valence and conduction band edges and, in this connection, various electron spectroscopies can be used as tools for diagnosis of the relevant electronic and geometric properties....
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| 6. |
- Guo, J.-H., et al.
(författare)
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Resonant and nonresonant x-ray scattering spectra of some poly(phenylenevinylene)s
- 1998
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Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 108:14, s. 5990-5996
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Tidskriftsartikel (refereegranskat)abstract
- The electronic structure of some poly(phenylenevinylene)s have been investigated by resonant and nonresonant x-ray inelastic scattering spectroscopies. The nonresonant as well as all resonant spectra for each polymer demonstrate benzene-like features, indicating a local character of the x-ray emission in which the phenyl ring acts as a building block. Theoretical simulations of x-ray energies and intensities taking the repeat unit as a model molecule of the polymer agree with the experimental spectra fairly well. The edges of the occupied bands have been identified in the nonresonant spectra of each polymer. By subtracting the emission energy of the highest occupied molecular orbital in the nonresonant spectrum from the core excitation energy in the resonant spectrum an alternative way to determine the optical band gap is obtained. As for free benzene the outer π band in the polymer spectra show a depletion of the emission going from the nonresonant to the resonant x-ray emission spectra. It is demonstrated that this transition, which is strictly symmetry forbidden for free benzene, becomes effectively forbidden in the polymer case as a result of strong interference effects, and it is argued that this is the general case for resonant x-ray emission of conjugated polymers as far as the frozen orbital approximation holds.
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| 7. |
- Guo, J.H., et al.
(författare)
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Resonant excitation x-ray-fluorescence from C-60
- 1995
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Ingår i: Physical Review B Condensed Matter. - 0163-1829 .- 1095-3795. ; 52, s. 10681-
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Tidskriftsartikel (refereegranskat)abstract
- X-ray fluorescence of condensed C-60 has been recorded in high resolution using monochromatic synchrotron radiation excitation. Strong intensity modulation of constituent spectral features is observed with varying excitation energy up to 10 eV above threshold. The energy dependence is interpreted as due to resonant inelastic x-ray scattering, leading to symmetry selection rules governing the two-photon process in the fully symmetric molecule.
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| 8. |
- GUO, JH, et al.
(författare)
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RESONANT AND NONRESONANT X-RAY-SCATTERING FROM C-70
- 1995
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Ingår i: CHEMICAL PHYSICS LETTERS. - : ELSEVIER SCIENCE BV. - 0009-2614. ; 235:1-2, s. 152-159
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Resonant and non-resonant X-ray scattering spectra of the C-70 molecule are presented and analyzed by ab initio Hartree-Fock calculations using a newly developed formalism for symmetry selective inelastic X-ray scattering. Compared to C-60, a weak excitat
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| 9. |
- Guo, JH, et al.
(författare)
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Resonant and nonresonant x-ray scattering spectra of some poly(phenylenevinylene)s
- 1998
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Ingår i: JOURNAL OF CHEMICAL PHYSICS. - 0021-9606. ; 108:14, s. 5990-5996
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The electronic structure of some poly(phenylenevinylene)s have been investigated by resonant and nonresonant x-ray inelastic scattering spectroscopies. The nonresonant as well as all resonant spectra for each polymer demonstrate benzene-like features, ind
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| 10. |
- GUO, JH, et al.
(författare)
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RESONANT EXCITATION X-RAY-FLUORESCENCE FROM C-60
- 1995
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Ingår i: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMER INST PHYSICS. ; 52:15
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- X-ray fluorescence of condensed C-60 has been recorded in high resolution using monochromatic synchrotron radiation excitation. Strong intensity modulation of constituent spectral features is observed with varying excitation energy up to 10 eV above thres
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