A5053196992- Chinese history and philosophy
- Advanced Chemical Physics Studies
- Eurasian Exchange Networks
- Atomic and Molecular Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Epilepsy research and treatment
- Japanese History and Culture
- Neuroscience and Neuropharmacology Research
- Advanced Neuroimaging Techniques and Applications
- Global Maritime and Colonial Histories
- Spectroscopy and Laser Applications
- Spectroscopy and Quantum Chemical Studies
- Amino Acid Enzymes and Metabolism
- Colonialism, slavery, and trade
- Laser-induced spectroscopy and plasma
- Inorganic Fluorides and Related Compounds
- 3D IC and TSV technologies
- Historical Economic and Social Studies
- Atmospheric Ozone and Climate
- Photochemistry and Electron Transfer Studies
- Politics and Conflicts in Afghanistan, Pakistan, and Middle East
- Folklore, Mythology, and Literature Studies
- China's Ethnic Minorities and Relations
- Advancements in Photolithography Techniques
Portland State University
2024
British Museum
2011-2024
Innowep (Germany)
2023
UNSW Sydney
2022
Yale University
2013-2021
Resonance Research (United States)
2015-2016
Renmin University of China
2013
Peking University
2013
IBM (United States)
2008
Uppsala University
2000-2002
By exploiting the core-excitation-induced dissociation of ${\mathrm{O}}_{2}$, we find that Auger emission exhibits a Doppler-like energy shift. We show this to be manifestation localization core hole and propose problem core-hole versus delocalization in spectroscopies may resolved by considering nature measurement.
The independent particle approximation is shown to break down for the photoionization of both inner and outer $n\ensuremath{\ell}$ $(\ensuremath{\ell}>0)$ electrons all atoms, at high enough energy, owing interchannel interactions with nearby $\mathrm{ns}$ channels. effect illustrated Ne $2p$ in 1 keV photon energy range through a comparison theory experiment. implications x-ray photoelectron spectroscopy molecules condensed matter are discussed.
A gas-phase time-of-flight (TOF) apparatus, capable of supporting as many six electron-TOF analyzers viewing the same interaction region, has been developed to measure energy- and angle-resolved electrons with kinetic energies up 5 keV. Each analyzer includes a newly designed lens system that can retard about 2% their initial energy without significant loss transmission; thus achieve resolving power (E/ΔE) greater than 104 over wide kinetic-energy range. Such high is comparable photon...
Second-order [ O(k(2)), k = omega/c] nondipole effects in soft-x-ray photoemission are demonstrated via an experimental and a theoretical study of angular distributions neon valence photoelectrons the 100-1200 eV photon-energy range. A newly derived expression for nondipolar characterizes second-order using four new parameters with primary contributions from pure-quadrupole octupole-dipole interference terms. Independent-particle calculations these account significant portion existing...
Reduced precipitation in the Miocene triggered geographic contraction of rainforest ecosystems around world. In Australia, this change was particularly pronounced; mesic that once dominated landscape transformed into shrublands, grasslands, and deserts today. A lack well-preserved fossils has made it difficult to understand nature Australian before aridification. Here, we report on an exceptionally biota from New South Wales, Australia. This Konservat-Lagerstätte hosts a rich diversity...
The femtosecond dissociation of HCl after core excitation has been studied through the resonant Auger decay. spectra contain contributions from decay occurring at both ``molecular'' and ``atomic'' internuclear distances. We have observed a new interference mechanism in these spectra: An atomic spectral line develops into negative contribution, ``hole,'' when detuning energy maximum $\mathrm{Cl}{2p}^{\ensuremath{-}1}{\ensuremath{\sigma}}^{*}$ resonance. Resonant x-ray scattering theory...
Relative photoionization cross sections for and produced by the Auger decay of a 1s hole in atomic oxygen were measured using synchrotron radiation between 525 553 eV. Energies quantum defects members two Rydberg series converging to ionization thresholds determined. In addition, calculated from series. The 182 meV resolution monochromator allowed detailed study over both revealing evidence post-collision interaction allowing comparison continuum above with that Ar edges. This indicates...
The objective of the present study is to identify novel, time-indexed imaging biomarkers epileptogenesis in mesial temporal lobe epilepsy (MTLE).We used high-resolution brain diffusion tensor (DTI) translationally relevant methionine sulfoximine (MSO) infusion model MTLE. MSO inhibits astroglial glutamine synthetase, which deficient epileptogenic hippocampal formation patients with MSO-infused (epileptogenic) rats were compared phosphate-buffered saline (PBS)-infused (nonepileptogenic) at...
Anion-yield spectroscopy using x rays is shown to be a selective probe of molecular core-level processes, providing unique experimental verification shape resonances. For CO, partial anion and cation yields are presented for photon energies near the C $K$ edge. The ${\mathrm{O}}^{\ensuremath{-}}$ yield exhibits features above threshold related only doubly excited states, in contrast which also exhibit pronounced structure due well-known ${\ensuremath{\sigma}}^{*}$ resonance. Because...
A combined experimental and theoretical study of argon valence photoionization illustrates the discovery broad lack validity independent-particle approximation (IPA) for x-ray photoemission. In addition to previously known breakdowns IPA, which are limited high photon energies regions very near threshold, observed breakdown in at intermediate demonstrates generally that IPA is valid only restricted domains. These restrictions expected be relevant throughout periodic table, with consequences...
A Doppler-type shift in the kinetic energy of atomic Auger electrons emitted after fast dissociation O3 molecules is observed. The resonant spectrum from decay repulsive core-excited states reflects both early molecular ozone and that excited fragments. fragment manifested as an lines when measurement made under certain conditions. We report measurements energy-split emission arising on a time scale comparable to core-hole lifetime. For O 1s–σ* release amounts several electron volts. for...
The abstract concept of “the Silk Road” linking east and west shapes many popular narrative histories, encouraging readers to think dreamily dazzling silks carried as luxury trade items on the backs camels over sun-scorched sand dunes, conveniently skirting more complex issues such political, military, religious cultural barriers. actual mechanics how any trading other financial or economic transactions took place are seldom addressed, references money few far between.
Abstract Objective The astroglial enzyme glutamine synthetase (GS) is deficient in small loci the brain adult patients with different types of focal epilepsy; however, role this deficiency pathogenesis epilepsy has been difficult to assess due a lack sufficiently sensitive and specific animal models. aim study was develop an vivo approach for precise deletions GS gene postnatal brain. Methods We stereotaxically injected various adeno‐associated virus (AAV)–Cre recombinase constructs into...
The O $1s\ensuremath{\rightarrow}{\ensuremath{\sigma}}^{*}$ transition below the $K$-edge in ${\mathrm{O}}_{2}$ has been investigated by absorption, constant ionic state (CIS) experiments, and extensive configuration interaction calculations. CIS scans of three lowest-lying final states reached resonant Auger decay provide a wealth information on energy range, symmetry, spin multiplicity intermediate with ${\ensuremath{\sigma}}^{*}$ character. We conclude that identification only two...