Irradiation effects on the wide-bandgap semiconductor material GaN are of interest to the USAF due to this material’s applicability for a wide range of on-orbit uses. Irradiation is also a valuable tool in analyzing the damage and defect formation dynamics of the material which is of great use in determining and correcting deficiencies in material growth processes. GaN samples representing seve...

Nitric oxide ('NO) has many complex and diverse biological functions. 1-3 For example, it functions as an endothelium-derived relaxing factor (EDRF), a vascular antioxidant, and as a messenger molecule in the cardiovascular and immune systems. Nitric oxide also plays important roles in the biochemical aspects of a plethora of disorders. A molecule of such significance needs reliable methods for...

Elucidating the structure and dynamics of biomacromolecules, for example, proteins, RNA, or DNA, is crucial for understanding their physiological function. Beside widespread techniques, such as NMR spectroscopy or crystallography, sophisticated electron paramagnetic resonance spectroscopy (EPR) methods in combination with site-directed spin labelingll ) are receiving increasing attention for th...

Ternary copper(II) complexes containing bi and tridentate polyamine ligands, viz. [Cu(dien)(en)](ClO4)2 (1), [Cu(dien)(temed)](ClO4)2 (2) and [Cu(pmdt)(temed)](ClO4)2 (3) where dien = diethylenetriamine, en = ethylenediamine, temed = N,N,N′,N′-tetramethylethylenediamine and pmdt = N,N,N′,N′,N′′-pentamethyldiethylenetriamine have been synthesized and characterized by elemental analysis, magnetic...

Low Temperature Matrix Isolation - Electron Paramagnetic Resonance (LTMI-EPR) Spectroscopy was utilized to identify the species of iron oxide nanoparticles generated during the oxidative pyrolysis of 1-methylnaphthalene (1-MN). The otherwise gas-phase reactions of 1--MN were impacted by a polypropylenimine tetra-hexacontaamine dendrimer complexed with iron (III) nitrate nonahydrate diluted in a...

A technique that is increasingly being used to determine the structure and conformational flexibility of biomacromolecules is Pulsed Electron-Electron Double Resonance (PELDOR or DEER), an Electron Paramagnetic Resonance (EPR) based technique. At X-band frequencies (9.5 GHz), PELDOR is capable of precisely measuring distances in the range of 1.5-8 nm between paramagnetic centres but the orienta...

An electron paramagnetic resonance (EPR) mobile universal surface explorer (MOUSE) was recently introduced for noninvasively studying pigments in paintings. This study determined that the EPR MOUSE could map spatial locations of four a simple impasto painting. Results from three spectral identification algorithms were examined to assess their ability identify using an unsupervised approach. Res...

Electron paramagnetic resonance (EPR) spectroscopy at 94 GHz is used to study the dark-stable tyrosine radical Y(D)(*) in single crystals of photosystem II core complexes (cc) isolated from the thermophilic cyanobacterium Synechococcus elongatus. These complexes contain at least 17 subunits, including the water-oxidizing complex (WOC), and 32 chlorophyll a molecules/PS II; they are active in li...

Biomolecular complexes are often multimers fueling the demand for methods that allow unraveling their composition and geometric arrangement. Pulse electron paramagnetic resonance (EPR) spectroscopy is increasingly applied for retrieving geometric information on the nanometer scale. The emerging RIDME (relaxation-induced dipolar modulation enhancement) technique offers improved sensitivity in di...

A set of four copper(ii) complexes, and (X = Cl, Br; = N-(l-leucine methyl ester)-N'-((2-pyridin-2-yl)methyl)oxalamide and = N-benzyl-N'-((2-pyridin-2-yl)methyl)oxalamide), have been synthesized and characterized by X-ray structural analysis, electron paramagnetic resonance (EPR) spectroscopy on single crystals and by SQUID magnetization measurements. X-ray diffraction studies show one-dimensio...