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Showing 1 to 20 of 31 for “"Magnetic Circular Dichroism"”.
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Investigation of the Structure and Kinetics of Heme-Containing Proteins Using Magnetic Circular Dichroism and Rapid-Scan, Stopped-Flow Spectroscopy
… properties of heme-containing proteins, magnetic circular dichroism (MCD) spectrophotometry was used to determine structural aspects of different heme-containing proteins. </p> <p> In part one of this dissertation, two projects highlight the kinetics of reacting thiolate-ligated heme …
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Implications For the Role of the Peroxoferric Intermediate In the Second Step of Nitric Oxide Synthase Derived From the Reactivity of P450-Cam With Camphor-5-Oxime and Characterization of the Heme Iron Coordination Structures of Tyrosine- and Histidine-Ligated Heme Enzymes Using Magnetic Circular Dichroism Spectroscopy
… in this step of the NOS catalytic cycle.</p> <p>Magnetic circular dichroism (MCD) and UV-Visible (UV-Vis) absorption spectroscopy have been used to characterize the heme-iron coordination structure of (A) several tyrosinate-ligated heme enzymes and (B) the high potential (HP) and low potential …
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Characterization of metal sites. I. In molybdoenzymes and their model systems, and, II. On silver electrode surfaces
… was made through the use of optical and magnetic circular dichroism (MCD) spectroscopy. MCD spectra were obtained for (MOCl$\sb4$) $\sp-$ (M = Cr, and Mo) and (WOCl$\sb4$(H$\sb2$O)) $\sp-$ compounds. All of the spectra display temperature and field dependence consistent with a …
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Studies in Magnetism and Superconductivity under Extreme Pressure
… create new superconductors, change the magnetic state of a material, and induce structural transitions. In Eu metal the strong local-moment magnetism in divalent Eu: 4f<super>7</super>) suppresses superconductivity. Under sufficiently high pressure, Eu is expected to become trivalent and …
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Magnetic structures and proximity effects in rare-earth / transition metal ferromagnetic and superconductor systems
The antiferromagnetic coupling between a rare-earth (RE) and a tran- sition metal (TM) ferromagnet can be exploited to engineer normal state and superconducting functional devices. RE/TM ferromagnetic multi- layers were previously used as spin-mixers to generate spin-triplet su- percurrents. This …
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Half-metallic CrO_2 thin films for spintronic applications
… device (SQUID) and element specific X-ray magnetic circular dichroism (XMCD) techniques were employed to investigate the effect of this substrate-induced strain on the magnetic properties of the films. Magnetic tunnel junctions (MTJ) were fabricated with CrO_2 , Cr_2 O_3 [natural oxide of …
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Magneto-optical studies of RirA and cytochrome cd1
… using variable-temperature variable-field (VTVF) Magnetic Circular Dichroism (MCD) spectroscopy. The novel heme d1 nitrosyl has thus been identified as an unprecedented FeIII-NO• species. In absorption spectra, this form of nitrosyl-heme d1 is indistinguishable from the low-spin FeIII state. But …
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Μελέτη της σχέσης δομής-μαγνητισμού σε λεπτά υμένια με ακτινοβολία σύγχροτρον και με συμβατικές πειραματικές τεχνικές
… κυκλικού μαγνητικού διχρωϊσμού ακτίνων Χ (x-ray magnetic circular dichroism – XMCD) άμορφα και κρυσταλλικά υμένια με παρόμοια σύνθεση. Αφενός, για πρώτη φορά μετρήθηκε η επαγόμενη μαγνητική ροπή στο ζιρκόνιο και το ύττριο σε άμορφα και κρυσταλλικά μαγνητικά υμένια και διαχωρίστηκαν οι μαγνητικές …
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Magneto-optical spectroscopic studies of multi-heme enzymes
… of electronic absorption, electron paramagnetic resonance (EPR) and magnetic circular dichroism (MCD) spectroscopies. Rebinding of tyrosine to the d1-heme, and loss of the bound product occurs concomitantly with a switch back to bis-histidinyl ligation at the c-heme at a rate of ~ 0.24 …
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Magneto-optical spectroscopic studies of multi-heme enzymes
… of electronic absorption, electron paramagnetic resonance (EPR) and magnetic circular dichroism (MCD) spectroscopies. Rebinding of tyrosine to the d1-heme, and loss of the bound product occurs concomitantly with a switch back to bis-histidinyl ligation at the c-heme at a rate of ~ 0.24 …
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Defect-induced magnetism and transport phenomena in epitaxial oxides
… films. In the first part, the origin of the ferromagnetic properties of Mn-doped and undoped zinc oxide is studied. The deposition conditions are found to have a significant impact on the structural, transport and magnetic properties of the thin films. Combining x-ray magnetic circular dichroism …
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Spectroscopic Characterization of H93G Myoglobin Cavity Mutant As A Versatile Protein Scaffold For Modeling Native Heme Iron Coordination Structures and Investigation of the Structure and Mechanism of the Dual-Function Enzyme, Amphitrite Ornata Dehaloperoxidase
… H93G Mb adducts have been characterized with magnetic circular dichroism and UV-visible absorption spectroscopy. The resulting data have substantially expanded the spectral database which is utilized to establish the coordination structure of heme centers in newly discovered heme proteins of …
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Synthesis, molecular and solid state structures, and magnetic properties of sandwich lanthanide phthalocyanines lacking C-H bonds
… M = Tb, Dy, Lu, Y. Single molecular magnetic (SMM) behavior in the (F_{64}Pc)_2TbH and (F_{64}Pc)_2DyH complexes was confirmed through slowed relaxation response of their magnetization in an applied time varying magnetic field during alternating current (AC) magnetic testing in the …
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Spin transport in few-layer graphene
… spin transport and spin detection, using magnetic electrodes and single/multilayer graphene. Although it has been very actively researched since 2006, there is still disagreement regarding the spin diffusion length (lsf). This is partially because insufficient attention has been paid to …
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Stabilizing Degenerate Dopants in Colloidal Semiconductor Nanocrystals
… at the nanocrystal surfaces. Chapter 4 applies magnetic circular dichroism (MCD) spectroscopy to identify classical cyclotron splittings in plasmonic semiconductor nanocrystals, and compares their magnetic signatures with those exhibited by plasmonic metal nanoparticles. We demonstrate that the …
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Diluted Magnetic Semiconductor Cobalt and Europium Implanted ZnO Thin Film
Diluted magnetic semiconductors (DMSs) have initiated enormous scientific interests because of their potential for multifunctional spintronics devices. ZnO based semiconductors have been identified to be the promising room temperature ferromagnetic materials with a wide band-gap. However, the …
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Heteroepitaxial Interfaces Modify Collective States in Complex Oxides
… imbalance on electronic transport and magnetic order were discussed under the formalism of the double exchange interaction. By constructing DSLs with LaMnO3, SrMnO3 and CaMnO3, electronic properties in ordered pseudo alloys having average doping, x=⅓ was compared with random alloy …
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Spin and Carrier Relaxation Dynamics in InAsP Ternary Alloys, the Spin-orbit-split Hole Bands in Ferromagnetic InMnSb and InMnAs, and Reflectrometry Measurements of Valent Doped Barium Titanate
… alloys. The second project focused on the ferromagnetic narrow gap semiconductors InMnAs and InMnSb. The incorporation of Mn can lead to ferromagnetic behavior of InMnAs and InMnSb, and enhance the g-factors, making them ideal candidates for spintronics devices. When grown using Molecular Beam …
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Magnetoelectric Properties of Epitaxial Spinel Oxide Thin Films
… thin films on perovskite SrTiO3 substrates. The magnetic and electrical properties of FVO films are presented as well as the characterization of magnetoelectric coupling of the material. Secondly, another unique spinel, Cobalt Chromite, CoCr2O4 (CCO), which has a canted conical magnetic ordering …
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Magnetism and spin transport studies on indium tin oxide
… multi-functional spintronic devices, a dilute magnetic oxide system is developed where the In2O3 and ITO matrices are doped with low levels of transition metals, in particular, Co. Using a number of characterisation techniques, the origins of the magnetic response in these thin films is …
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