The Sydney basin region experiences some high ozone episodes in summer, especially in the north west and south west of Sydney. Observation-based methods can be used to provide a means to access the potential extent of photochemical smog problem at various regions in the Sydney area. In this study, the observation-based Integrated Empirical Rates (IER) model is used to determine and understand t...

A model-based approach is here developed and applied to predict the long-term trends of indirect photochemical processes in the surface layer (5m water depth) of Lake Maggiore, NW Italy. For this lake, time series of the main parameters of photochemical importance that cover almost two decades are available. As a way to assess the relevant photochemical reactions, the modelled steady-state conc...

The dual nature of ~3-~2-~4-~N,N-diethylamino!phenyl!ethenyl!-5,5-dimethyl-1,2-cyclohexenylidene!propanedinitrile ~Lemke-e! allows us to write both quasipermanent and erasable holographic gratings in the same storage volume. In the presence of a triplet excited sensitizer, Lemke-e undergoes a photochemical reaction allowing the creation of quasipermanent photochemical holographic gratings. In a...

We report here on significant enhancement of the photochemical etching of p-type gallium phosphide (GaP) by Au plasmonic nanostructures. The photochemical etching rate of defect (dislocation) states of Au-coated p-GaP samples is ten times higher than blank samples when irradiated with 532 nm laser. It is confirmed that the enhancement of photochemical etching is wavelength selective. Only 532 n...

Coherent multidimensional electronic spectroscopy is commonly used to investigate photophysical phenomena such as light harvesting in photosynthesis in which the system returns back to its ground state after energy transfer. By contrast, we introduce multidimensional spectroscopy to study ultrafast photochemical processes in which the investigated molecule changes permanently. Exemplarily, the ...

Photodegradation is one of the processes that pesticides may undergo once dispersed in the environment. It requires an adequate overlapping between the emission spectrum of the light source and the absorption spectrum of the compound to be degraded. When such condition is fulfilled, molecules undergo light absorption, being promoted to an excited electronic state, from where they can relax via ...

The field of gas phase photochemistry has progressed explosively in the past few decades due to the development of ultra fast high power lasers. Unique properties of lasers such as monochromaticity, coherence, tunability over a wide wavelength range and high intensity makes them a powerful pump and probe tool for a number of spectroscopic as well as photochemical studies like laser induced fluo...

The complete set of viable deletion strains in Saccharomyces cerevisiae was screened for sensitivity of mutants to five oxidants to identify cell functions involved in resistance to oxidative stress. This screen identified a unique set of mainly constitutive functions providing the first line of defense against a particular oxidant; these functions are very dependent on the nature of the oxidan...