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Hydroxyl ion absorption information


Hydroxyl ion absorption is the absorption in optical fibers of electromagnetic radiation, including the near-infrared, due to the presence of trapped hydroxyl ions remaining from water as a contaminant.

The hydroxyl (OH) ion, can penetrate glass during or after product fabrication, resulting in significant attenuation of discrete optical wavelengths, e.g., centred at 1.383 μm, used for communications via optical fibres.

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Hydroxyl ion absorption

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Hydroxyl ion absorption is the absorption in optical fibers of electromagnetic radiation, including the near-infrared, due to the presence of trapped...

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Hydroxyl radical

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The hydroxyl radical, •HO, is the neutral form of the hydroxide ion (HO–). Hydroxyl radicals are highly reactive and consequently short-lived; however...

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Electromagnetic absorption by water

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Celsius. Dielectric spectroscopy Differential optical absorption spectroscopy Hydroxyl ion absorption in optical fiber Water model John Bertie. "John Bertie's...

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Hydroxide

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compound HO• is the hydroxyl radical. The corresponding covalently bound group –OH of atoms is the hydroxy group. Both the hydroxide ion and hydroxy group...

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Hydroxy group

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atmospheres is present as dissociated ions. Wikimedia Commons has media related to Hydroxyl group. Hydronium Ion Oxide Hydroxylation "Alcohols". Gold Book...

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Glass coloring and color marking

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explanation coloring Color of medieval stained glass Hydrogen darkening Hydroxyl ion absorption Transparent materials Bernard H. W. S. De Jong, Ruud G. C. Beerkens...

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Properties of water

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each other and are strongly polar. This polarity allows it to dissociate ions in salts and bond to other polar substances such as alcohols and acids, thus...

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Borate

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of the tetraborate ion ([B4O7]2−). This anion has the same topology as the tetrahydroxytetraborate ion, but without the hydroxyl groups and all boron...

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Bile acid

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micelle-forming surfactants, which encapsulate nutrients, facilitating their absorption. These micelles are suspended in the chyme before further processing....

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Vitamin B12

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injected intravenously for the purpose of treating cyanide poisoning, as the hydroxyl group is displaced by cyanide, creating a non-toxic cyanocobalamin that...

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Copper pesticide

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(imidazole, phosphate, sulfhydryl, and, hydroxyl groups) present in many proteins and disrupt their functions. Copper ions can kill pathogen cells on plant surfaces...

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Optical glass

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from 200 nm to 2.5 μm, due to the high gap energies and photon absorption peaks of hydroxyl groups in the infrared. A variety of oxides are used, the most...

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Hydride

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medium for ionic hydrides because the hydride ion is a stronger base than hydroxide and most hydroxyl anions. Hydrogen gas is liberated in a typical...

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Cyanocobalamin

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cobalt by quaternization with methyl iodide, it is replaced by H 2O or hydroxyl ions. Various secondary alkyl halides are then readily attacked by the modified...

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Basics of blue flower colouration

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that can form complexes with metal ions are only cyanidin or delphinidin type, because at least two free hydroxyl groups in the B-ring are necessary to...

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Interstellar medium

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also contributes, both in emission and by absorption of photons from background warm gas ('H I self-absorption', HISA). While not important for cooling...

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Titanium dioxide

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strong oxidative potential of the positive holes oxidizes water to create hydroxyl radicals. It can also oxidize oxygen or organic materials directly. Hence...

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Sorbitol

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another sugar alcohol; the two differ only in the orientation of the hydroxyl group on carbon 2. While similar, the two sugar alcohols have very different...

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Photodynamic therapy

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mechanism. These species include singlet oxygen (1O2), hydroxyl radicals (•OH) and superoxide (O2−) ions. They can interact with cellular components including...

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Optical fiber

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attacks. Their best attribute is that they lack the absorption band associated with the hydroxyl (OH) group (3,200–3,600 cm−1; i.e., 2,777–3,125 nm or...

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Spectroscopy

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ions. Mössbauer spectroscopy probes the properties of specific isotopic nuclei in different atomic environments by analyzing the resonant absorption of...

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Lunar water

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spectra gathered in the thin atmosphere above the Moon's surface and hydroxyl absorption lines in reflected sunlight. On September 25, 2009, NASA declared...

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Discovery and development of bisphosphonates

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among the most recent bisphosphonates to be used clinically where the hydroxyl group in position R2 has been omitted to ensure stability. Recent research...

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Iron preparation

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Barry; Gutteridge, John M.C. (1992). "Biologically relevant metal ion-dependent hydroxyl radical generation an update". FEBS Letters. 307 (1): 108–112. doi:10...

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Humectant

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humectant is often a molecule with several hydrophilic groups, most often hydroxyl groups; however, amines and carboxyl groups, sometimes esterified, can...

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Cholesterol

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modulates membrane fluidity over the range of physiological temperatures. The hydroxyl group of each cholesterol molecule interacts with water molecules surrounding...

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Crown ether

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backbone, these compounds have proved to be sensitive ion probes, as changes in the absorption or fluorescence of the photoactive groups can be measured...

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Citrulline

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where it is synthesized from arginine. Arginine is first oxidized into N-hydroxyl-arginine, which is then further oxidized to citrulline concomitant with...

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