Refine by
Photochemistry Articles & Analysis
26 articles found
Summertime and the Livin’… More and more sunlight as summer approaches affects the photochemistry in the air. Ultraviolet (UV) light from the sun can then drive the formation of ground-level ozone during daytime, at least if ozone precursors such as nitrogen oxides (NOX) and hydrocarbons are present. ...
ByOPSIS AB
Comprising eight chapters, the book discusses time dependence and applications of fluorescence; basic principles of the single photon counting lifetime measurement; light sources; photomultipliers; electronics; data analysis; nanosecond time-resolved emission spectroscopy; time dependence of fluorescence anisotropy.Modern Molecular Photochemistry - Nicholas TurroAn excellent book ...
Edinburgh Instruments Molecular Spectroscopy instrumentation is capable of serving the most demanding needs of research within those areas.FLS1000Edinburgh Instruments FLS1000 is a state of the art, modular photoluminescence spectrometer for the most demanding applications in Photophysics, Photochemistry, Material Science and Life Sciences. The FLS1000 sets the standard in both ...
In practice, the time it takes for this decay to end is difficult to determine and so, instead, the time is measured for the peak luminescence intensity to decrease by a defined fraction. In photochemistry in general and O2 sensor technology specifically, this fraction is always the reciprocal of the natural number, e, (2.71828) and so the fraction is 0.368. ...
We understand that choosing the right spectroscopy instrumentation can be difficult, which is why we have highlighted the most popular Spectroscopy Instrumentation products from our Photonics division in this product overview.FLS1000 Photoluminescence SpectrometerThe FLS1000 is a state-of-the-art, modular photoluminescence spectrometer for the most demanding applications in Photophysics, ...
Alfa Chemistry is one of the leading suppliers of photochemistry products, ranging from fluorophores, fluorescent probes, luminescence material, photosensitizers, and photocatalysts, to quantum dots. ...
Titan, the largest moon of Saturn, hosts a thick nitrogen-based atmosphere, where HCN is also efficiently produced by endogenous atmospheric photochemistry. Titan is moreover surrounded by an organic photochemical haze, which was probed by the Cassini/Huygens space mission [Tomasko et al., 2008 ; Liang et al., 2007]. ...
A clear diurnal variation pattern of BC and RCT was noticed in all the seasons, and day time peak in RCT suggested enhanced coating on BC due to the condensable coating material 25 originated from photochemistry. Examination of sub-micron aerosol chemical composition highlighted that the IGP outflow is dominated by organics (47-49%) and marine/coastal airmasses contained greater ...
The PCA also suggests a negative response of wind speeds on the afternoon O 3 formation, whereas roles of ambient temperature on the O 3 were seasonally different.Keywords: Bangkok Metropolitan Region, BMR, biomass burnings, NO x titration, photochemistry, principal component analysis, PCA, traffic emissions, urban ozone pollution, ...
The results obtained showed that photochemistry with ethanol under UV radiation (96.10%) was more efficient than photochemistry with ethanol under visible light (48.07%). ...
This approach reduces the problems associated with over–describing the system.Keywords: ultra–fast laser spectroscopy, transient absorption spectra, femtosecond time–resolved spectroscopy, photochemistry, Bayesian data analysis, hard modelling, soft modelling, python, data analysis software, nanotechnology, Markov chain Monte Carlo, ...
The implications of these findings are discussed.Keywords: air quality modelling, environmental pollution, naphthalene, photochemistry, secondary organic aerosol, SOA, gasoline and diesel emissions ...
The photochemistry of organic pollutants has received increasing attention in ice and snow. ...
The second approach consists of coupling the Lagrangian model AUSTAL2000 with the OZIPR box model. In both approaches the photochemistry is included in the mode by using a quasi–linear reaction rates coefficient which is used to affect the mass of the Lagrangian particles. ...
It was found an overestimation of NO2 in the urban areas, probably due to an underestimation of the vertical diffusivity; the analysis of OX confirms that the discrepancies in O3 and NO2 are mainly due to local scale effects; the model shows a general underestimation of the observed PM10 concentrations due to the uncertainties in the emission inventories, spatial resolution, and the adopted ...
The photochemistry of para-chlorophenol (4-CP) was studied under simulated sunlight (λ > 300 nm) and UV irradiation by using a 125 W high-pressure mercury lamp with or without a hard glass as light source in an ice matrix. ...
Soybean rust–induced reductions in CER were mainly associated with lower efficiency of photosystem II (PSII) photochemistry and damage to PSII reaction centers. Therefore, visual indicators such as light absorptance and disease severity do not reflect the degree of impact of SBR on leaf ...
As knowledge evolved beyond a perception of “inert” pollutants to urban photochemistry, regulation began to foresee certain positive and negative collateral effects of simple emission rollback strategies for pollution control. ...
Ozone production within the valley is estimated to 20 to 30 µg/m³ and 10 µg/m³ are locally produced from precursors emitted by international traffic through the tunnel.Keywords: air pollution, mesoscale modelling, complex terrain, Alpine Valleys, photochemistry, ozone production, atmospheric dispersion modelling, France, air quality, pollutant ...
As well, reactions including photochemistry, and the various transformations of the hydrocarbon through these reactions can enhance the hydrocarbon decomposition. ...