Context. The largest satellite of Neptune, Triton, is a likely Kuiper Belt object captured by the planet. It has tenuous nitrogen atmosphere, similar to that Pluto, and it may be an ocean world. Neptunian system only been visited once: Voyager 2 in 1989. Over past few years, demand for new mission ice giants their systems risen. Thus, theoretical basis upon which prepare such needed. Aims. We a...

Ozone data from 13 rural and 11 urban sites for the growth season (April through September) during 1990-2006 have been analysed on the basis of recently introduced photochemical pollution indicators. The indicators predict that urban sites are prone to photochemical pollution, although compared to some rural sites, the urban sites have lower average ozone concentrations and showed lower values ...

Holographic experiments are performed on a series of dual-use chromophore molecules wherein both irreversible photochromic and erasable photorefractive holographic gratings can be written in the same storage volume. At 675 nm, the chromophore undergoes a photochemical reaction leading to the creation of irreversible holographic gratings. Alternatively, at longer wavelengths, application of an e...

Abstract. From the Archean toward Proterozoic, Earth's atmosphere underwent a major shift from anoxic to oxic conditions at around 2.4 2.1 Ga known as Great Oxidation Event (GOE). This rapid transition may be related an atmospheric instability caused by formation of ozone layer. Previous works were all based on 1D photochemical models. Here, we revisit GOE with 3D photochemical–climate model in...

When subject to illumination, tetrathionate ion decomposes in an oscillatory fashion with a period of about 1 h to yield products identified as colloidal sulfur and trithionate ion. This system represents the first experimental example of a stirred, batch photochemical oscillator. A simple model consisting of four reaction steps and four adjustable rate parameters gives good agreement with the ...

A strategy for photochemical cleavage of peptide and protein backbones is described, which is based on a selenide-mediated cleavage of a backbone ester moiety. Studies in model systems establish the viability of the chemistry and suggest the method could be a valuable tool for chemical biology studies of proteins.

We conducted irradiation experiments with riverine, estuarine, and marine water samples to investigate the possibility of photochemical methane (CH4) formation. CH4 photoproduction was undetectable under oxic conditions or in the absence of methyl radical precursors indicating that its photochemical formation is negligible in the present ocean. Significant photochemical CH4 production was obser...

Research into the photochcmistry of biopolymcrs has increased in scope and scale to such an extent in recent years that it has become necessary to limit this review to a consideration of photochemical approaches to the structure of polynucleotides. Treatment proceeds from the constituent monomers to the polymer to emphasize the changes in photophysical and photochemical properties of the monome...