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Physical Sciences and Mathematics Commons™

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Chemistry

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Matthew E. Wise

Selected Works

2014

Articles 1 - 5 of 5

Full-Text Articles in Physical Sciences and Mathematics

Composition And Optical Properties Of Secondary Organic Aerosol Particles, Felisha Imholt, Ryan Caylor, Matthew E. Wise, John Shilling Oct 2014

Composition And Optical Properties Of Secondary Organic Aerosol Particles, Felisha Imholt, Ryan Caylor, Matthew E. Wise, John Shilling

Matthew E. Wise

No abstract provided.

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Optical Properties Of Secondary Organic Aerosols, Felisha Imholt, Ryan Caylor, Matthew E. Wise, John Shilling Oct 2014

Optical Properties Of Secondary Organic Aerosols, Felisha Imholt, Ryan Caylor, Matthew E. Wise, John Shilling

Matthew E. Wise

It is well known that the increased warming effect due to greenhouse gases is a major environmental concern. While the amount of solar radiation absorbed by greenhouse gases is known to a high certainty, the amount absorbed by secondary organic aerosols (SOA) is not. The experimental procedure used to measure the amount of radiation absorbed by SOA was optimized using fulvic acid. The optimized method was then used to measure how much radiation SOA absorb between ~200 and 800 nm. Using this data, mass absorption coefficient (MAC) values at 405 nm and imaginary refractive indexes (k) were calculated. These values …

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Composition Of Secondary Organic Aerosols, Ryan Caylor, Felisha Imholt, Matthew E. Wise, John Shilling Oct 2014

Composition Of Secondary Organic Aerosols, Ryan Caylor, Felisha Imholt, Matthew E. Wise, John Shilling

Matthew E. Wise

The enhanced greenhouse effect is considered one of our greatest global environmental problems. The amount of radiation absorbed by greenhouse gases is known to high certainty. However, absorbance from atmospheric aerosols particles is not. This study was conducted to determine the chemical composition of secondary organic aerosol particles (SOA) and to determine the compositional effect on their optical properties. The SOA were created in a temperature controlled chamber at Pacific Northwest National Laboratory (PNNL) in Richland, WA and collected on filters. The SOA were then analyzed for chemical composition using Fourier Transform Spectroscopy (FTIR). Analysis of the IR spectra revealed …

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Determination Of The Optical Properties Of Secondary Organic Aerosol Particles, Matthew E. Wise Jul 2014

Determination Of The Optical Properties Of Secondary Organic Aerosol Particles, Matthew E. Wise

Matthew E. Wise

The enhanced greenhouse effect is currently considered to be our most important global environmental problem. While the magnitude of radiation absorbed by greenhouse gases is known to a high certainty, the absorption of radiation by atmospheric aerosol particles is not. In the initial Visiting Faculty Program application, we proposed the use of an ultraviolet-visible (UV/Vis) spectrometer equipped with a liquid waveguide capillary flow cell to determine the extent to which secondary organic aerosol particles (SOA) absorb visible light. Early in the research period, the UV/Vis technique was optimized for three solvent systems (methanol, water and 0.1 M hydrochloric acid). Using …

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Determining The Optical Properties Of Secondary Organic Aerosols Using Uv/Vis Spectroscopy, Vanessa Selimovic Mar 2014

Determining The Optical Properties Of Secondary Organic Aerosols Using Uv/Vis Spectroscopy, Vanessa Selimovic

Matthew E. Wise

Atmospheric light-absorbing carbon (LAC) particles, which include black carbon (BC) and brown carbon (BrC) particles play an important role in global climate change. Currently, optical properties of BC are well defined, with studies showing absorption of light by BC at wavelengths above ~500 nm. At lower wavelengths of the visible light spectrum (300-500 nm), light absorption by BrC may be substantial. However, the extent of absorption is dependent on accurate knowledge of the optical properties of BrC, which are currently not well established. Optical properties of secondary organic aerosols (SOA), a variant of BrC, have been determined, but only for …

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