Department of Chemistry
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Hamers Research Group
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Widicus Weaver Research Group
This research group shares an affiliation with both the Department of Chemistry and the Department of Astronomy.
Recent Submissions
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Observations of biogenic volatile organic compounds over a mixed temperate forest during the summer to autumn transition
(2022-09-26)The exchange of trace gases between the biosphere and the atmosphere is an important process that controls both chemical and physical properties of the atmosphere with implications for air quality and climate change. The ... -
Measurements of Volatile Organic Compounds in an Occupied Classroom
(2022-07-27)This dataset contains measurements of indoor air quality made in an occupied classroom at the University of Wisconsin, Madison. The measurements are described in detail in the attached readme file. Measurements include: ... -
Observation-Based Constraints on Modeled Aerosol Surface Area: Implications for Heterogeneous Chemistry
(2022-05)Heterogeneous reactions occurring at the surface of atmospheric aerosol particles regulate the production and lifetime of a wide array of atmospheric gases. Aerosol surface area plays a critical role in setting the rate ... -
SPFIT input, output, and .lin files for the mm/sub-mm assignment and fit of the CH2NH2 radical
(2022-05)These are the input, output, and line files for the assignment and fitting of the millimeter/submillimeter spectrum CH2NH2 radical in the SPFIT program. File with and without the inclusion of spin-rotation fitting terms ... -
ERHAM input, output, and .lin files for the ground state mm/sub-mm assignment and fit of Ar-CH3OH
(2022-05)These are the input, output, and line files for the assignment and fitting of the millimeter/submillimeter spectrum of the Ar-CH3OH van der Waals cluster in the ERHAM program. -
ERHAM input, and output files for the ground state mm/sub-mm assignment and fit of pyruvic acid.
(ACS Earth and Space Chemistry, 2022-02-22)These are the input and output files used for fitting the millimeter/submillimeter rotational spectrum of pyruvic acid. -
Efficient production of carbonyl sulfide in the low-NOx oxidation of dimethyl sulfide
(Geophysical Research Letters, 2021-11-08)The oxidation of carbonyl sulfide (OCS) is the primary, continuous source of stratospheric sulfate aerosol particles, which can scatter shortwave radiation and catalyze heterogeneous reactions in the stratosphere. While ... -
Oceanic emissions of dimethyl sulfide and methanethiol and their contribution to sulfur dioxide production in the marine atmosphere
(Atmospheric Chemistry and Physics Discussions, 2021-10-18)Oceanic emissions of dimethyl sulfide (CH3SCH3, DMS) have long been recognized to impact aerosol particle composition and size, the concentration of cloud condensation nuclei (CCN), and Earth’s radiation balance. The impact ... -
Surface equilibration mechanism controls the molecular packing of glassy molecular semiconductors at organic interfaces
(United States National Academy of Sciences, 2021)Glasses prepared by physical vapor deposition (PVD) are anisotropic, and the average molecular orientation can be varied significantly by controlling the deposition conditions. While previous work has characterized the ... -
Marine gas-phase sulfur emissions during an induced phytoplankton bloom
(2021-07)The oxidation of dimethyl sulfide (DMS; CH3SCH3), emitted from the surface ocean, contributes to the formation of Aitken mode particles and their growth to cloud condensation nuclei (CCN) sizes in remote marine environments. ... -
Stable Glasses of Organic Semiconductor Resist Crystallization
(American Chemical Society, 2020)The instability of glassy solids poses a key limitation to their use in several technological applications. Well-packed organic glasses, prepared by physical vapor deposition (PVD), have drawn attention recently because ... -
Dense Glass Packing Can Slow Reactions with an Atmospheric Gas
(J. Phys. Chem. B, 2019-11-06)Previous work utilizing crystal polymorphs has established the importance of the molecular packing environment for modulating solid-gas reactivity. Here we show, for the first time, that the chemical stability of an amorphous ... -
Over What Length Scale Does an Inorganic Substrate Perturb the Structure of a Glassy Organic Semiconductor?
(American Chemical Society, 2020-05-13)While the bulk structure of vapor-deposited glasses has been extensively studied, structure at buried interfaces has received little attention, despite being important for organic electronic applications. To learn about ... -
Generic packing motifs in vapor-deposited glasses of organic semiconductors
(Royal society of chemistry, 2019-08-23)We study the structure of vapor-deposited glasses of five common organic semiconductors as a function of substrate temperature during deposition, using synchrotron X-ray scattering. For deposition at a substrate temperature ... -
Simultaneous Detection of Ozone and Nitrogen Dioxide by Oxygen Anion Chemical Ionization Mass Spectrometry: A Fast Time Response Sensor Suitable for Eddy Covariance Measurements
(Atmos. Meas. Tech., Published by Copernicus Publications on behalf of the European Geosciences Union., 2020-04-01)We report on the development, characterization, and field deployment of a fast time response sensor for measuring ozone (O3) and nitrogen dioxide (NO2) concentrations utilizing chemical ionization time-of-flight mass ...
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