PROBING ATMOSPHERIC AEROSOL AND GAS PROPERTIES WITH PHOTOACOUSTIC SPECTROSCOPY

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dc.contributor.advisorZachariah, Michael Ren_US
dc.contributor.advisorDickerson, Russell Ren_US
dc.contributor.authorBueno, Pedro Antonioen_US
dc.contributor.departmentChemistryen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2011-07-07T05:31:38Z
dc.date.available2011-07-07T05:31:38Z
dc.date.issued2011en_US
dc.description.abstractAbsorption by atmospheric aerosols is the wild card for global climate change. Issues regarding atmospheric gases and aerosols have been at the forefront and the work presented within is directed at those issues. Specifically, work has been performed in order to help understand the issue of absorption in the atmosphere and whether this contributes towards positive forcing or warming of the atmosphere. In the process of conducting this research a custom, first-principles photoacoustic spectrometer was improved, calibrated and used extensively in order to obtain knowledge of the interaction of light with atmospherically relevant gases and make the first measurements of absorbing aerosols. The absorption cross-section of uncoated and coated soot was measured and quantified and found to be consistent with other work where amplifications on the order of nearly 100% were observed with uncertainty levels much lower than previously reported. Soot was also found to be optically thin where the total mass of the soot contributes to the absorption. Consequential to the soot work, the photoacoustic spectrometer developed to measure the absorption was utilized as a high precision greenhouse gas sensor. The photoacoustic spectrometer was found to produce results on the absorption of CO2 to within 3% of the theoretically predicted line profile Moreover, the photoacoustic spectrometer was used to determine measurable coating thicknesses of less than 10 nanometers on 100 nm soot particles.en_US
dc.identifier.urihttp://hdl.handle.net/1903/11624
dc.subject.pqcontrolledatmospheric chemistryen_US
dc.subject.pqcontrolledanalytical chemistryen_US
dc.subject.pqcontrolledPhysical Chemistryen_US
dc.subject.pquncontrolledabsorptionen_US
dc.subject.pquncontrolledaerosolen_US
dc.subject.pquncontrolledclimate changeen_US
dc.subject.pquncontrolledcoatingen_US
dc.subject.pquncontrolledgreenhouse gasen_US
dc.subject.pquncontrolledphotoacoustic spectroscopyen_US
dc.titlePROBING ATMOSPHERIC AEROSOL AND GAS PROPERTIES WITH PHOTOACOUSTIC SPECTROSCOPYen_US
dc.typeDissertationen_US

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