S. C. Chung

Cell Biotech (South Korea)

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K. L. Tsang

National Synchrotron Radiation Research Center

D. J. Huang

National Yang Ming Chiao Tung University

C. F. Chang

Max Planck Institute for Chemical Physics of Solids

Y. F. Song

Shenyang Agricultural University

P.-C. Tseng

National Taiwan Normal University

Jiunn Chen

National Pingtung University

C.T. Chen

National Synchrotron Radiation Research Center

T.-E. Dann

National Synchrotron Radiation Research Center

Shin‐Guang Shyu

Institute of Chemistry, Academia Sinica

Hok-Sum Fung

National Synchrotron Radiation Research Center

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National Synchrotron Radiation Research Center

117

National Tsing Hua University

Tamkang University

National Taiwan University

National Yang Ming Chiao Tung University

Academia Sinica

National Cheng Kung University

Institute of Chemistry, Academia Sinica

National Sun Yat-sen University

Lawrence Berkeley National Laboratory

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Orbital magnetic moments of oxygen and chromium inCrO2

Physical review. B, Condensed matter (2002)

D. J. Huang Horng‐Tay Jeng C. F. Chang Guang‐Yu Guo Jiunn Chen

With measurements of the magnetic circular dichroism and band-structure calculations in the local spin density approximation (LSDA+U) approach, we revealed that the orbital moment of O in ${\mathrm{CrO}}_{2}$ is ferromagnetically coupled to that of Cr, whereas the spin moment of O is antiferromagnetically coupled to that of Cr. Spin and orbital magnetic moments of Cr and O are enhanced as Coulomb interaction energy U increases. Comparing the magnetic circular diachromism data with the LSDA+U calculations, we conclude that it is essential to include the on-site Coulomb energy for adequately describing the orbital magnetic moments of ${\mathrm{CrO}}_{2}.$

10.1103/physrevb.66.174440

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Citations (40)

A unique high-performance wide-range (10–1500 eV) spherical grating monochromator beamline

Journal of Synchrotron Radiation (1998)

P.-C. Tseng C.-C. Chen T.-E. Dann S. C. Chung C. T. Chen

A wide-spectral-range high-performance 6 m-spherical grating monochromator (6 m-SGM) beamline has been designed and is under construction at SRRC. Two different entrance slits, instead of additional mirrors, are used to optimize the overall performance. Six gratings are used to cover photon energies from 10 to 1500 eV. Movable entrance slits and bendable vertical focusing mirrors are used to enhance further the beamline performance. A bendable horizontal focusing mirror is used to improve the resolution and to focus the photon beam at the experimental station immediately after the exit slit. Several end-stations can be installed at the same time to utilize the beam time fully. The expected energy-resolving power, with both slit openings set at 10 micro m, is up to 15 000 and 40 000 for the high- and low-energy branches, respectively. A photon flux of 1 x 10(11) photons s(-1) can be obtained with an energy-resolving power of 20 000.

Monochromator

Photon flux

Photon energy

10.1107/s090904959701282x

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Citations (8)

Current status of the 6 m low-energy spherical grating monochromator beamline at SRRC

Review of Scientific Instruments (1995)

P.-C. Tseng H. J. Lin S. C. Chung C.-I. Chen H.-F. Lin

The 6 m low-energy spherical grating monochromator (6 m-LSGM) beamline at SRRC is at its commission stage. The 6 m-LSGM beamline, which covers photon energies from 15 to 200 eV, is based on Dragon concept with spherical gratings and movable exit slit. Some of the commission data will be presented in this paper. The photoabsorption spectra of Ar, He, and Kr have been recorded with resolution so far unattained in the vacuum ultraviolet region.

Monochromator

Photon energy

10.1063/1.1145874

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Citations (8)

Corrosion and tribological studies of chromium nitride coated on steel with an interlayer of electroplated chromium

Surface and Coatings Technology (2000)

Sheng Han Jhe-Yu Lin Su-Yueh Tsai S. C. Chung D.Y. Wang

Chromium nitride

Cathodic arc deposition

10.1016/s0257-8972(00)00979-8

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Citations (40)

Resonant photoemission and photoabsorption at the Ni L2,3 edges of NiGa and Ni3Ga

Journal of Magnetism and Magnetic Materials (1998)

Li‐Shing Hsu K. L. Tsang S. C. Chung

Inverse photoemission spectroscopy

10.1016/s0304-8853(97)00908-6

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Citations (8)

Copper Centers in the Cryo-EM Structure of Particulate Methane Monooxygenase Reveal the Catalytic Machinery of Methane Oxidation

Journal of the American Chemical Society (2021)

Wei‐Hau Chang Hsin-Hung Lin I.K. Tsai Shih-Hsin Huang S. C. Chung

The particulate methane monooxygenase (pMMO) is the first enzyme in the C1 metabolic pathway in methanotrophic bacteria. As this enzyme converts methane into methanol efficiently near room temperature, it has become the paradigm for developing an understanding of this difficult C1 chemistry. pMMO is a membrane-bound protein with three subunits (PmoB, PmoA, and PmoC) and 12-14 coppers distributed among different sites. X-ray crystal structures that have revealed only three mononuclear coppers at three sites have neither disclosed the location of the active site nor the catalytic mechanism of the enzyme. Here we report a cyro-EM structure of holo-pMMO from Methylococcus capsulatus (Bath) at 2.5 Å, and develop quantitative electrostatic-potential profiling to scrutinize the nonprotein densities for signatures of the copper cofactors. Our results confirm a mononuclear CuI at the A site, resolve two CuIs at the B site, and uncover additional CuI clusters at the PmoA/PmoC interface within the membrane (D site) and in the water-exposed C-terminal subdomain of the PmoB (E clusters). These findings complete the minimal set of copper factors required for catalytic turnover of pMMO, offering a glimpse of the catalytic machinery for methane oxidation according to the chemical principles underlying the mechanism proposed earlier.

Methane Monooxygenase

10.1021/jacs.1c04082

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Citations (50)

Performance of a Mott detector for undulator-based spin-resolved spectroscopy

Review of Scientific Instruments (2002)

D. J. Huang Wen-Bin Wu Jiunn Chen C. F. Chang S. C. Chung

To measure spin-polarized core-level electron spectra, a spectrometer equipped with a highly efficient retarding-potential Mott spin polarimeter using undulator-based soft-x-ray beamlines has been set up. With a thin film of Au as a target this polarimeter has an efficiency estimated to be ∼2×10−4. The performance of this system for spin-polarized spectroscopy has been tested using core-level spin-polarized photoemission of magnetic and nonmagnetic thin films excited with linearly and circularly polarized light, respectively. Measurements using a new spin-resolved absorption technique are also discussed.

Polarimeter

Undulator

10.1063/1.1510552

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Citations (18)

A Soft X-Ray (300–1000 eV) Active Grating Monochromator Beamline at NSRRC

AIP conference proceedings (2007)

Hok-Sum Fung Jih-Young Yuh Huang Liang Tse-Chuan Tseng S. Y. Perng

Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation H. S. Fung, J. Y. Yuh, L. J. Huang, T. C. Tseng, S. Y. Perng, D. J. Wang, K. L. Tsang, S. C. Chung; A Soft X‐Ray (300–1000 eV) Active Grating Monochromator Beamline at NSRRC. AIP Conf. Proc. 19 January 2007; 879 (1): 563–566. https://doi.org/10.1063/1.2436123 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAIP Publishing PortfolioAIP Conference Proceedings Search Advanced Search |Citation Search

Monochromator

Soft X-rays

10.1063/1.2436123

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Citations (4)

EXAFS study of atmospheric corrosion products on zinc at the initial stage

Corrosion Science (2000)

S. C. Chung Andrew Lin Jen-Ray Chang H.C. Shih

Zinc hydroxide

10.1016/s0010-938x(00)00019-6

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Citations (34)