Results 241 to 250 of about 3,205,015 (299)

Enhanced detection of aromatic oxidation products using NO₃ ^- chemical ionization mass spectrometry with limited nitric acid.

Environ Sci Atmos
Garmash O, Kumar A, Jha S, Barua S, Hyttinen N, Iyer S, Rissanen M.   +6 more
europepmc   +1 more source

Assessing the importance of nitric acid and ammonia for particle growth in the polluted boundary layer.

Environ Sci Atmos
Marten R, Xiao M, Wang M, Kong W, He XC, Stolzenburg D, Pfeifer J, Marie G, Wang DS, Elser M, Baccarini A, Lee CP, Amorim A, Baalbaki R, Bell DM, Bertozzi B, Caudillo L, Dada L, Duplissy J, Finkenzeller H, Heinritzi M, Lampimäki M, Lehtipalo K, Manninen HE, Mentler B, Onnela A, Petäjä T, Philippov M, Rörup B, Scholz W, Shen J, Tham YJ, Tomé A, Wagner AC, Weber SK, Zauner-Wieczorek M, Curtius J, Kulmala M, Volkamer R, Worsnop DR, Dommen J, Flagan RC, Kirkby J, McPherson Donahue N, Lamkaddam H, Baltensperger U, El Haddad I.   +46 more
europepmc   +1 more source

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Acidities of Nitrous and Nitric Acids

European Journal of Inorganic Chemistry, 2005
AbstractThe energies of nitrous and nitric acid and their anions were calculated at the MP2(FC)/6‐311++G(2d,2p) level. Their acidity was related to the acidity of hydroxylamine derivatives using isodesmic reactions. This procedure reveals that the molecules of HNO2 and HNO3 are strongly stabilized (by 119 or 206 kJ·mol–1, respectively) but their anions
Otto Exner, Stanislav Boehm
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Aspects of the surface and bulk nitration of cellulose in nitric acid, nitric acid/water, and nitric acid/dichloromethane mixes

Journal of Applied Polymer Science, 1990
AbstractElectron spectroscopy for chemical analysis (ESCA) has been employed to follow the surface nitration of cellulose papers in nitric acid–water and nitric acid–dichloromethane mixes with the aim of: elucidating the identity of the nitrating species in these mixes and from comparison of surface and bulk degree of substitution (DOS) further ...
R. D. Short, H. S. Munro
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Acidity of nitrous and nitric acids

Inorganic Chemistry, 1988
The origin of the acidity of nitrous and nitric acids was studied via an analysis of the results of ab initio calculations using the 6-311++G** basis set. The difference in energy between the Z and E conformers of nitrous acid could be reproduced when correction was made for electron correlation, and the gas-phase ionization energies of nitrous and ...
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First-Principles Infrared Spectrum of Nitric Acid and Nitric Acid Monohydrate Crystals

The Journal of Physical Chemistry A, 2004
The spectra of nitric acid and nitric acid monohydrate crystals, including both vibration frequencies and infrared intensities, have been calculated from first principles using the methodology developed for the SIESTA program. In this method, infrared intensities are evaluated from the macroscopic polarization changes with atomic displacements per ...
Fernández Torre, Delia, Escribano, Rafael, Archer, Tom, Pruneda, Miguel, Artacho, Emilio   +4 more
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Humidity, Ice, and Nitric Acid

Science, 2004
R. S. Gao et al. report average relative humidity, with respect to ice, of over 130% in the vicinity of low-temperature cirrus clouds and contrails (Reports, “Evidence that nitric acid increases relative humidity in low-temperature cirrus clouds,” 23 Jan., p. [516][1]).
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At the Water's Edge:  Nitric Acid as a Weak Acid

Journal of the American Chemical Society, 2007
Nitric acid plays a role in many important chemical processes that happen in our environment, often at surfaces where less is known about its reactive behavior. Recent studies have shown that undissociated nitric acid is present on the surface of a nitric acid solution. Using ab initio molecular dynamics simulations, we show that a nitric acid molecule
Eric S, Shamay, Victoria, Buch, Michele, Parrinello, Geraldine L, Richmond   +3 more
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Nitric acid in rain water

Journal of Chemical Education, 1973
This trace analysis experiment is based on the conversion of nitrate to nitrite using a cadmium amalgam reductor column.
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