Results 81 to 90 of about 122,502 (355)

Is either direct photolysis or photocatalysed H-shift of peroxyl radicals a competitive pathway in the troposphere?

open access: yesRoyal Society Open Science, 2020
Peroxyl radicals (RO[Formula: see text]) are key intermediates in atmospheric chemistry, with relatively long lifetimes compared to most other radical species.
Rashid R. Valiev, Theo Kurten
doaj   +1 more source

Primary and secondary dissociation pathways in the ultraviolet photolysis of Cl_2O [PDF]

open access: yes, 1994
The photodissociation of dichlorine monoxide (Cl_2O) at 308, 248, and 193 nm was studied by photofragment translational energy spectroscopy. The primary channel upon excitation at 308 and 248 nm was Cl–O bond fission with production of ClO+Cl. A fraction
Minton, Timothy K.   +3 more
core  

Effects of atmospheric sphericity on stratospheric chemistry and dynamics over Antarctica [PDF]

open access: yes, 2005
Atmospheric sphericity is an important factor that must be considered in order to evaluate an accurate ozone loss rate in the polar stratosphere. The built-in plane-parallel radiative transfer scheme of a nudging chemical transport model (CTM) and an ...
Akiyoshi   +43 more
core   +2 more sources

photolysis

open access: yes, 2014
Citation: 'photolysis' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.P04624 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
openaire   +1 more source

Photochemical generation of the 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical from caged nitroxides by near-infrared two-photon irradiation and its cytocidal effect on lung cancer cells

open access: yesBeilstein Journal of Organic Chemistry, 2019
Novel caged nitroxides (nitroxide donors) with near-infrared two-photon (TP) responsive character, 2,2,6,6-tetramethyl-1-(1-(2-(4-nitrophenyl)benzofuran-6-yl)ethoxy)piperidine (2a) and its regioisomer 2b, were designed and synthesized. The one-photon (OP)
Ayato Yamada   +7 more
doaj   +1 more source

Stable isotope fractionation during ultraviolet photolysis of N_2O [PDF]

open access: yes, 1998
The biogeochemical cycling of nitrous oxide plays an important role in greenhouse forcing and ozone regulation. Laboratory studies of N_2O:N_2 mixtures irradiated between 193–207 nm reveal a significant enrichment of the residual heavy nitrous oxide ...
Blake, Geoffrey A.   +3 more
core  

High-spin intermediates of the photolysis of 2,4,6-triazido-3-chloro-5-fluoropyridine

open access: yesBeilstein Journal of Organic Chemistry, 2013
In contrast to theoretical expectations, the photolysis of 2,4,6-triazido-3-chloro-5-fluoropyridine in argon at 5 K gives rise to EPR peaks of just two triplet mononitrenes, two quintet dinitrenes, and a septet trinitrene.
Sergei V. Chapyshev   +3 more
doaj   +1 more source

Near-UV photolysis cross sections of CH_3OOH and HOCH_2OOH determined via action spectroscopy [PDF]

open access: yes, 2006
Knowledge of molecular photolysis cross sections is important for determining atmospheric lifetimes and fates of many species. A method and laser apparatus for measurement of these cross sections in the near-ultraviolet (UV) region is described.
Fry, J. L.   +3 more
core   +1 more source

Observations of HONO by laser-induced fluorescence at the South Pole during ANTCI 2003 [PDF]

open access: yes, 2006
Observations of nitrous acid (HONO) by laser-induced fluorescence (LIF) at the South Pole taken during the Antarctic Troposphere Chemistry Investigation (ANTCI), which took place over the time period of Nov. 15, 2003 to Jan.
Case, A T   +4 more
core   +2 more sources

New light on vitamin B12: The adenosylcobalamin-dependent photoreceptor protein CarH

open access: yesSouth African Journal of Science, 2016
Adenosylcobalamin (AdoCbl), or coenzyme B12, is a cofactor for enzymes important in metabolism in humans (and other mammals) and bacteria. AdoCbl contains a Co-C bond and is extremely light sensitive, but, until recently, this light sensitivity appeared ...
Susan M. Chemaly
doaj   +1 more source

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