Hyung Kim
Professor Carnegie Mellon University
Biography
Areas of Expertise
Social
Industry Expertise
Accomplishments
KIAS Scholar, School of Computational Sciences, Korea Institute for Advanced Study
2008-present
Education
Seoul National University
B.S.
Physics
Seoul National University
M.S
Physics
State University of New York at Stony Brook
Ph.D.
Physics
1988
Links
Articles
Synchrotron, luminescence, and XPS studies of Gd3+: Dy3+: Ce3+ tri-rare-earth oxides in borate glasses
Radiation Physics and Chemistry2023
Synchrotron studies were employed to understand the oxidation state and coordination chemistry of the Ce3+ ions which when added with Dy3+- co-doped calcium zinc gadolinium borate glasses prepared by conventional melt quenching technique. X-ray photoelectron spectroscopy was employed to understand the coordination chemistry of the prepared glass samples. Detailed analysis was investigated to understand the glass's optical properties such as density, refractive index, molar volume, field strength, inter-ionic radius, and average boron-boron distance.
Spectroscopic and Chemical Properties of Ionic Liquids: Computational Study
The Chemical Record2023
A brief account is given of highlights of our computational efforts – often in collaboration with experimental groups – to understand spectroscopic and chemical properties of ionic liquids (ILs). Molecular dynamics, including their inhomogeneous character, responsible for key spectral features observed in dielectric absorption, infra‐red (IR) and fluorescence correlation spectroscopy (FCS) measurements are elucidated. Mechanisms of chemical processes involving imidazolium‐based ILs are illustrated for CO2 capture and related reactions, transesterification of cellulose, and Au nanocluster‐catalyzed Suzuki cross‐coupling reaction with attention paid to differing roles of IL ions. A comparison with experiments is also made.
Search for solar bosonic dark matter annual modulation with COSINE-100
Physical Review D2023
We present results from a search for solar bosonic dark matter using the annual modulation method with the COSINE-100 experiment. The results were interpreted considering three dark sector bosons models: solar dark photons, Dine-Fischler-Srednicki-Zhitnisky (DFSZ) and Kim-Shifman-Vainshtein-Zakharov (KSVZ) solar axions, and Kaluza-Klein solar axions. No modulation signal compatible with the expected from the models was found from a dataset of 2.82 yr, using 61.3 kg of NaI (Tl) crystals.
Influence of Gd3+ on structural and luminescence properties of new Eu3+-doped borate glass for photonics material
Radiation Physics and Chemistry2023
The Gd2O3–La2O3–ZnO–B2O3–Eu2O3 glasses with different Gd2O3 concentration (Gd:LaZnBEu) were studied in the physical, structural, optical and luminescence properties. The density and refractive index of glass increased with addition of Gd2O3 content. The FTIR spectra demonstrated the BO3 and BO4 borate complexes as the main construction in glass those were more disturbed by Gd2O3 increasing. The BO4/BO3 and bridging/non-bridging oxygen ratio, observed from XPS, changed by following the Gd2O3 concentration whose 10 mol% owned the highest values of both ratios.
A novel amalgamation of Gd2MoB2O9: CeF3 phosphor with ZnO: BaO: B2O3 glass using microwave synthesis for scintillation material applications
Radiation Physics and Chemistry2023
This work investigates the physical, structural, optical, photoluminescence, and X-ray luminescence properties of Gd1.5MoB2O9: 0.5CeF3 mixed 10ZnO:35BaO:55B2O3 glass with a weight ratio of 1:9. The samples were prepared by heating with microwave synthesis technique varying the time from 5 min to 10 min. The structural studies were analysed using X-ray diffraction analysis (XRD) and the oxidation of cerium atom were analysed using X-ray analysis near edge spectra (XANES). An X-ray diffraction analysis to investigate the structure of samples using by a Shimadzu XRD–6100 diffractometer.
