Výsledky vyhledávání - "Oliver Hemmers"

High-Pressure Behavior of Mullite: An X-Ray Diffraction Investigation

Autor: Patricia E. Kalita, Kristina Lipinska, Hartmut Schneider, Andrew Cornelius, Stanislav V. Sinogeikin, Oliver Hemmers

Publikováno v: Journal of the American Ceramic Society. 96:1635-1642

Using synchrotron X-ray diffraction and diamond anvil cells we performed in situ high-pressure studies of mullite-type phases of general formula Al4+2xSi2−2xO10−x and differing in the amount of oxygen vacancies: 2:1-mullite (x = 0.4), 3:2-mullite

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::351eb86804fcd37393d032418b59a368
https://doi.org/10.1111/jace.12191

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New pressure induced phase transitions in mullite-type Bi2(Fe4 – x Mn x )O10 – δ complex oxides

Autor: Michael W. Lufaso, N Florida, Patricia E. Kalita, Kristina Lipinska, Koln, CIW, Zachary R. Kann, Hartmut Schneider, Stanislav V. Sinogeikin, Andrew Cornelius, Oliver Hemmers

Publikováno v: International Journal of Materials Research. 103:464-468

Single phased mullite-type Bi2Fe4 – x Mn x O10 – δ mixed crystals (0.25 ≤ x ≤ 3.125) and the end-member Bi2Fe4O9, synthesized from the oxides by reaction sintering up to 825°C, were studied at high-pressures in order to probe their high-pre

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6c0fd1ff710c42063159142a3164bdbe
https://doi.org/10.3139/146.110719

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Electronic structure of CdO studied by soft X-ray spectroscopy

Autor: Wladek Walukiewicz, Maryna Chernyshova, Jonathan D. Denlinger, G. Derkachov, Krystyna Lawniczak-Jablonska, Tolek Tyliszczak, Derrick T. Speaks, Oliver Hemmers, Kin Man Yu, I. N. Demchenko

Publikováno v: Journal of Electron Spectroscopy and Related Phenomena. 184:249-253

We present X-ray absorption spectroscopy (XAS) and resonance inelastic X-ray scattering (RIXS) measurements of CdO thin film. The observed differences between bulk and surface XAS signals suggest the presence of a surface electron accumulation layer

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::63ead118cb284e2f80e7e0b2f99cb413
https://doi.org/10.1016/j.elspec.2010.09.011

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XANES studies of modified and newly synthesized nanostructured manganese oxides

Autor: Tolek Tyliszczak, Maryna Chernyshova, Oliver Hemmers, Krystyna Lawniczak-Jablonska, Nancy Birkner, Wayne C. Stolte, I. N. Demchenko

Publikováno v: Journal of Electron Spectroscopy and Related Phenomena. 171:24-29

The interesting chemical and physical properties of Mn-oxide-based nanomaterials offer a variety of technological applications. The novel Mn-oxide properties reached through synthetic design have the potential to be of tremendous contribution to mode

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::014daebcf32076bd898d8264f091afb5
https://doi.org/10.1016/j.elspec.2008.12.005

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Micro-structural characterization of precipitation-synthesized fluorapatite nano-material by transmission electron microscopy using different sample preparation techniques

Autor: Longzhou Ma, G. W. Chinthaka Silva, Oliver Hemmers, Dennis W. Lindle

Publikováno v: Micron. 39:269-274

Fluorapatite is a naturally occurring mineral of the apatite group and it is well known for its high physical and chemical stability. There is a recent interest in this ceramic to be used as a radioactive waste form material due to its intriguing che

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eec515a5f784414ba772c8cd8d00e391
https://doi.org/10.1016/j.micron.2007.09.004

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Nondipole Effects in Chiral Molecules Measured with Linearly Polarized Light

Autor: Oliver Hemmers, W.C. Stolte, Dennis W. Lindle, Maria Novella Piancastelli, Renaud Guillemin, K. P. Bowen

Publikováno v: Journal of Physics: Conference Series
Journal of Physics: Conference Series, IOP Publishing, 2015, 635 (11), pp.112053 ⟨10.1088/1742-6596/635/11/112053⟩
Journal of Physics: Conference Series, 2015, 635 (11), pp.112053 ⟨10.1088/1742-6596/635/11/112053⟩

International audience; We present the first-ever measurement of nondipole chiral angular distribution parameters for C 1s photoemission from each enantiomer of camphor in the photon energy range 296-343eV using linearly polarized light. The angular

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7690eeff40803baf7f3fc166f955046f
https://hal.sorbonne-universite.fr/hal-01265686/file/document-5.pdf

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Experimental investigation of nondipole effects in photoemission at the advanced light source

Autor: Oliver Hemmers, Renaud Guillemin, Dennis W. Lindle, Steven T. Manson

Publikováno v: Radiation Physics and Chemistry. 73:311-327

Breakdowns in the dipole approximation in the soft-X-ray photon-energy range ( h ν 5 keV ) were first observed 30 years ago and have been studied theoretically for many years. However, only recently their significance at low energies has been apprec

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bf065601c05e694bdc12dd4be14f265b
https://doi.org/10.1016/j.radphyschem.2005.03.004

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Nondipole effects in soft X-ray photoemission

Autor: Renaud Guillemin, Oliver Hemmers, Dennis W. Lindle

Publikováno v: Radiation Physics and Chemistry. 70:123-147

Although breakdowns in the dipole approximation in the soft-X-ray photon-energy range (hν keV ) were first observed 30 years ago and have been studied theoretically for many years, their significance at low energies remained generally unappreciated

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6e8b1c1d1140a8879859304fa99ef79e
https://doi.org/10.1016/j.radphyschem.2003.12.009

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Anion formation moderated by post-collision interaction following core-level photoexcitation of CO

Autor: Oliver Hemmers, Wayne C. Stolte, Dennis W. Lindle, Renaud Guillemin, D. L. Hansen

Publikováno v: Journal of Physics B: Atomic, Molecular and Optical Physics. 35:L381-L386

The photon-energy dependence of the oxygen-anion (O−) yield has been measured following photoexcitation of CO just above both the C and O K-shell ionization thresholds. The observed exponentially decaying yields above both edges are attributed to a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d7c4e43d77091a68dd48e8b737912c93
https://doi.org/10.1088/0953-4075/35/17/101

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Dipole and nondipole angular-distribution effects in valence photoemission from neon

Autor: Oliver Hemmers, M. Blackburn, Dennis W. Lindle, T. Goddard, Peter Glans, Ivan A. Sellin, H. Wang, Scott B. Whitfield, Ralf Wehlitz

Publikováno v: Journal of Electron Spectroscopy and Related Phenomena. 123:257-264

Nondipole angular-distribution parameters γ and δ for neon 2s and 2p photoelectrons have been measured and are compared to all available theoretical data. The agreement is very good throughout the 150–1200 eV photon-energy range studied. Furtherm

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bf325afbd29390e138d9b4c251881633
https://doi.org/10.1016/s0368-2048(02)00025-7

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