منابع مشابه
Photochemical processing of aqueous atmospheric brown carbon
Atmospheric brown carbon (BrC) is a collective term for light absorbing organic compounds in the atmosphere. While the identification of BrC and its formation mechanisms is currently a central effort in the community, little is known about the atmospheric removal processes of aerosol BrC. As a result, we report on a series of laboratory studies of photochemical processing of BrC in the aqueous ...
متن کاملModeling of Photochemical Reactions in a Focused Laser Beam, II
A method is described for obtaining the rate constant of the photodegradation process of fluorophores illuminated by a focused laser beam. The explicit kinetic equations, describing the population dynamics of excited singlet and triplet states, are averaged over the illuminated volume to describe the resulting fluorescence signal. The illumination is modulated at frequencies from 1 Hz to 100 Hz...
متن کاملModeling of Photochemical Reactions in a Focused Laser Beam
Fluorescent materials play a prominent role in the qualitative and quantitative measurement of scientific phenomena of importance in biotechnology and biomedical applications. Photodegradation of fluorophores is a process that determines the accuracy and sensitivity of such measurements. This is the motivation for developing methods for accurately measuring fluorophore photodegradation rates. R...
متن کاملNon-linear photochemical pathways in laser-induced atmospheric aerosol formation
We measured the chemical composition and the size distribution of aerosols generated by femtosecond-Terawatt laser pulses in the atmosphere using an aerosol mass spectrometer (AMS). We show that nitric acid condenses in the form of ammonium nitrate, and that oxidized volatile organics also contribute to particle growth. These two components account for two thirds and one third, respectively, of...
متن کاملDissymmetrization of Microparticle Surface by Laser-Induced Photochemical Deposition
We investigate the surface dissymmetrization of micro-sized particles by using the photochemical reduction of chromate ions induced by a strongly focused continuous Ar laser wave to nucleate and grow deposits onto one hemisphere of silica beads dispersed in the chromate solution. Growth of dissymmetric coatings is performed at nm 514 = λ with laser fluences varying from to 3 . 1 2 10.1 kW cm . ...
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ژورنال
عنوان ژورنال: The Review of Laser Engineering
سال: 2010
ISSN: 0387-0200,1349-6603
DOI: 10.2184/lsj.38.39