Probing symmetry breaking upon core excitation with resonant x-ray fluorescence

Skytt, P.; Guo, Jinghua; Wassdahl, N.; Nordgren, Joseph; Luo, Yi; Ågren, Hans

doi:10.1103/physreva.52.3572

Cited by 91 publications

(60 citation statements)

References 25 publications

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“…The bands ͑peak A and part of peak B͒ are dramatically depleted in the resonant case as a result of the symmetry selection rules. 15,28 Only a very small structure of peak A remains which may be due to a small incoherent contribution ͓Ref. 29͑a,b͔͒ or related to carbon lone-pair orbital.…”

Section: Resultsmentioning

confidence: 99%

The electronic structure of polyaniline and doped phases studied by soft x-ray absorption and emission spectroscopies

Magnuson

Guo

Butorin

et al. 1999

The Journal of Chemical Physics

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The electronic structure of the conjugated polymer, polyaniline, has been studied by resonant and nonresonant soft x-ray emission spectroscopy using synchrotron radiation for the excitation. The measurements were made on polyaniline and a few doped ͑protonated͒ phases for both the carbon and nitrogen contents. The resonant x-ray emission spectra show depletion of the electron bands due to the selective excitation which enhances the effect of symmetry selection rules. The valence band structures in the x-ray emission spectra attributed to the bands show unambiguous changes of the electronic structure upon protonation. By comparing to x-ray absorption measurements, the chemical bonding and electronic configuration is characterized.

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Section: Resultsmentioning

confidence: 99%

The electronic structure of polyaniline and doped phases studied by soft x-ray absorption and emission spectroscopies

Magnuson

Guo

Butorin

et al. 1999

The Journal of Chemical Physics

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“…Although it does show reduced intensity, there is a significant intensity remaining, which was argued as being due to a final state vibronic coupling effect in Ref. 26.…”

Section: B Resonant X-ray Inelastic Scattering Spectramentioning

confidence: 98%

“…3. The spectrum of benzene, the main part of which is well understood, 26 is also included for comparison. The energy scales of the spectra have been aligned by using the elastic peak in the RIXS spectra presented later.…”

Section: A Nonresonant Inelastic X-ray Scattering Spectramentioning

confidence: 99%

“…Similarly to the nonresonant case, the resonant spectra of poly͑phenylenevinylene͒s demonstrate a strong similarity with the resonant spectrum of benzene. Before going through the poly͑phenylenevi-nylene͒s, we briefly recapitulate the spectrum of benzene, 26 then focus on the energy range corresponding to bands A and B of the nonresonant spectrum. The lowest unoccupied molecular orbital ͑LUMO͒ is 1e 2u ͑using ground state D 6h point group symmetry͒.…”

Section: B Resonant X-ray Inelastic Scattering Spectramentioning

confidence: 99%

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Resonant and nonresonant x-ray scattering spectra of some poly(phenylenevinylene)s

Guo

Magnuson

Såthe

et al. 1998

The Journal of Chemical Physics

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The electronic structure of some poly͑phenylenevinylene͒s 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 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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“…2͒ there are two inequivalent carbon atom sites located in the phenyl and ethanol side groups. A comparison of the carbon K␣ XES of PTES with spectra of benzene 25 and ethanol 26 ͑see Fig. 1͒ shows that the carbon K␣ XES of PTES have features that closely resemble those of only benzene monomer because in three-dimensional siloxane gel there is no ethanol and no bonds between carbon and an hydroxide OH.…”

Section: A Electronic Structure and Chemical Bonding Of Unirradiatedmentioning

confidence: 99%

X-ray fluorescence study of organic-inorganic polymer conversion into ceramics induced by ion irradiation

et al. 1999

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Changes to the local and electronic structures of phenyltriethoxysilane ͑PTES͒ films when irradiated at room temperature with gold ion concentrations of 5ϫ10 14 to 2.5ϫ10 15 cm Ϫ2 and with carbon ion concentrations of 5ϫ10 15 cm Ϫ2 were studied using x-ray emission and photoelectron spectroscopies. The fluorescent ultrasoft silicon L II,III and carbon K␣ x-ray emission spectra of unirradiated and irradiated PTES films were measured at the Advanced Light Source, and the Center for Advanced Microstructures and Devices. It is found that the PTES polymers that are exposed to ion doses higher than 5ϫ10 14 cm Ϫ2 convert to Si:O:C ceramics. Annealing the irradiated PTES polymer films at 1000°C segregates the carbon atoms into sp 2 -like clusters.

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Probing symmetry breaking upon core excitation with resonant x-ray fluorescence

Cited by 91 publications

References 25 publications

The electronic structure of polyaniline and doped phases studied by soft x-ray absorption and emission spectroscopies

The electronic structure of polyaniline and doped phases studied by soft x-ray absorption and emission spectroscopies

Resonant and nonresonant x-ray scattering spectra of some poly(phenylenevinylene)s

X-ray fluorescence study of organic-inorganic polymer conversion into ceramics induced by ion irradiation

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