Download or read book Characterization of Gas aerosol Interaction Kinetics Using Morphology Dependent Stimulated Raman Scattering written by and published by . This book was released on 1993 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is aimed at characterizing the influence of aerosol surface structure on the kinetics of gas-aerosol interactions. Changes in gas phase chemical reaction rates as a function of exposure to a specific aerosol are measured with aerosols having different surface properties due to the composition and/or temperature of the material making up the aerosol. The kinetic data generated can be used directly in atmospheric modeling calculations. The surface structure of the aerosol is using morphology-dependent enhancement of simulated Raman scattering (MDSRS). Detailed dynamics of gas-aerosol interactions can be obtained by correlating the change in the reaction rate with change in surface structure and by monitoring the change in aerosol surface structure during, the course of the reaction. This dynamics information can be used to generate kinetic data for systems which are similar in nature to those studied, but are not amenable to laboratory investigation. We show here that increased MDSRS sensitivity is achieved by using an excitation laser source that has a narrow linewidth and we have been able to detect sulfate anion concentrations much lower than previously reported. We have shown that the linewidth of the MDSRS mode excited in a droplet is limited by the laser linewidth. This is a positive result for it eases our ability to quantify the MDSRS gain equation. This result also suggests that MDSRS signal size should be independent of droplet size, and preliminary experiments confirm this hypothesis.
Download or read book Characterization of Gas aerosol Interaction Kinetics Using Morphology Dependent Stimulated Raman Scattering Final Technical Report written by and published by . This book was released on 1992 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: A research program on the influence of aerosol surface structure on the kinetics of gas-aerosol interactions is proposed. The experiments involve measuring changes in gas phase chemical reaction rates as a function of exposure to a specific aerosol. Aerosols with differing surface properties will be generated by changing the composition and/or temperature of the material making up the aerosol. Kinetic data generated can be used directly in atmospheric modelling calculations. The surface structure of the aerosol will be measured, both before and after reaction, using morphology-dependent enhancement of simulated Raman scattering (MDSRS). Information about the detailed dynamics of gas-aerosol interactions can be obtained by correlating the change in the reaction rate with change in surface structure and by monitoring the change in aerosol surface structure during the course of the reaction. Studies will focus on the condensation and oxidation of sulfur species (sulfur dioxide and dimethyl sulfide) on water aerosols.
Download or read book Characterization of Gas aerosol Interaction Kinetics Using Morphology Dependent Stimulated Raman Scattering 1992 Annual Summary written by and published by . This book was released on 1993 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is aimed at characterizing the influence of aerosol surface structure on the kinetics of gas-aerosol interactions. Changes in gas phase chemical reaction rates as a function of exposure to a specific aerosol are measured with aerosols having different surface properties due to the composition and/or temperature of the material making up the aerosol. The kinetic data generated can be used directly in atmospheric modeling calculations. The surface structure of the aerosol is using morphology-dependent enhancement of simulated Raman scattering (MDSRS). Detailed dynamics of gas-aerosol interactions can be obtained by correlating the change in the reaction rate with change in surface structure and by monitoring the change in aerosol surface structure during, the course of the reaction. This dynamics information can be used to generate kinetic data for systems which are similar in nature to those studied, but are not amenable to laboratory investigation. We show here that increased MDSRS sensitivity is achieved by using an excitation laser source that has a narrow linewidth and we have been able to detect sulfate anion concentrations much lower than previously reported. We have shown that the linewidth of the MDSRS mode excited in a droplet is limited by the laser linewidth. This is a positive result for it eases our ability to quantify the MDSRS gain equation. This result also suggests that MDSRS signal size should be independent of droplet size, and preliminary experiments confirm this hypothesis.
Download or read book Understanding Atmospheric Aerosol Reactivity Using Morphology dependent Stimulated Raman Scattering Final Technical Report written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The long term focus of this research was to develop an experimental technique which can be used to characterize and monitor laboratory generated aerosol particles. The interest in aerosols developed because recent field studies have shown that heterogeneous chemistry is contributing far more to global atmospheric balance and climate change than had been previously thought. There became a pressing need for the kinetics of these systems to be well understood, but this presented a challenge for atmospheric aerosol systems that could not be studied using conventional surface science techniques. This is because they are comprised, for the most part, of volatile material. A new experimental technique, capable of monitoring surface species in these systems, needed to be developed. The author felt that morphology-dependent stimulated Raman scattering, MDSRS, fit the bill quite well.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research in Progress FY 1992 written by United States. Department of Energy. Office of Health and Environmental Research and published by . This book was released on 1993 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1993 with total page 1836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research in Progress written by United States. Department of Energy. Office of Health and Environmental Research and published by . This book was released on 1993 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acid Precipitation written by and published by . This book was released on 1993-07 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Development of Morphology Dependent Stimulated Raman Scattering MDSRS and Its Application to the Detection of Sulfate in Aerosol Particles written by Alan Scott Olson and published by . This book was released on 1993 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atmospheric Chemistry Program Program Operation Plan written by and published by . This book was released on 1993 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Colloid Science written by Terence Cosgrove and published by John Wiley & Sons. This book was released on 2010-02-16 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: Colloidal systems are important across a range of industries, suchas the food, pharmaceutical, agrochemical, cosmetics, polymer,paint and oil industries, and form the basis of a wide range ofproducts (eg cosmetics & toiletries, processed foodstuffs andphotographic film). A detailed understanding of their formation,control and application is required in those industries, yet manynew graduate or postgraduate chemists or chemical engineers havelittle or no direct experience of colloids. Based on lectures given at the highly successful Bristol ColloidCentre Spring School, Colloid Science: Principles, Methods andApplications provides a thorough introduction to colloidscience for industrial chemists, technologists and engineers.Lectures are collated and presented in a coherent and logical texton practical colloid science.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1993 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamentals and Applications in Aerosol Spectroscopy written by Ruth Signorell and published by CRC Press. This book was released on 2010-12-20 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: Helping you better understand the processes, instruments, and methods of aerosol spectroscopy, Fundamentals and Applications in Aerosol Spectroscopy provides an overview of the state of the art in this rapidly developing field. It covers fundamental aspects of aerosol spectroscopy, applications to atmospherically and astronomically relevant problem
Download or read book Raman Capabilities for Aerosol Characterization written by Richard K. Chang and published by . This book was released on 1980 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical speciation of microparticles can be achieved by spectral and intensity analyses of the inelastically scattered radiation (Raman and fluorescence). However, quantitative results by purely optical methods are intimately related to the environment with which the particles are in contact and the morphology of the microstructures. Morphology characterization of regularly shaped microparticles (spheres, cylinders, and spheroids) can be obtained by measuring the peaks in the extinction and elastically scattering spectra. Our investigation on the viability of quantitative species identification of molecules within a microparticle by inelastic laser scattering involved studies of the following: (1) dielectric and metal substrate interface to increase the intensity of the scattered radiation; and (2) morphology dependent dielectric resonances which can modify the scattering spectra.
Download or read book Government wide Index to Federal Research Development Reports written by and published by . This book was released on 1967-05 with total page 1470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
