Corey Jamieson - Academia.edu (original) (raw)
Papers by Corey Jamieson
Journal of Geophysical Research Planets, 2014
Hydrated chlorine salts are expected to exist on a variety of planetary bodies, including inner p... more Hydrated chlorine salts are expected to exist on a variety of planetary bodies, including inner planets such as Mars and outer planet satellites such as Europa. However, detection by remote sensing has been limited due to a lack of comparison data in spectral libraries. In addition, at low temperatures spectral features of many H2O-bearing species deviate from their room temperature behavior. Thus, we acquired spectra of NaCl, NaClO4∙nH2O, MgCl2∙nH2O, Mg(ClO4)2∙6H2O, and Mg(ClO3)2∙6H2O from 0.35-2.5 μm at both 298 and 80 K to observe the effects of temperature on diagnostic spectral features. In the NIR, the strongest spectral features often arise from water molecules. Increasing hydration states increases the depth and width of water bands. Interestingly, at low temperature these bands become narrower with sharper, better-defined minima, allowing individual bands to be more easily resolved. We also measured frozen eutectic solutions of NaCl, MgCl2, and KCl. We show that while care must be taken to acquire laboratory spectra of all hydrated phases at the relevant conditions (e.g. temperature, pressure) for the planetary body being studied, chlorine salts do possess distinct spectral features that should allow for their detection by remote sensing.
Inorganic chemistry, Jan 19, 2007
The formation of SF5CF3(X1A'), through the radical-radical recombination of SF5(X2A1) and CF3... more The formation of SF5CF3(X1A'), through the radical-radical recombination of SF5(X2A1) and CF3(X2A1), was observed for the first time in low-temperature sulfur hexafluoride-carbon tetrafluoride matrices at 12 K via infrared spectroscopy upon irradiation of the ices with energetic electrons. The nu1 fundamentals of the SF5(X2A1) and CF3(X2A1) radicals were monitored at 857 and 1110 cm-1, respectively; the newly formed trifluoromethyl sulfur pentafluoride molecule, SF5CF3(X1A'), was detected via its absorptions at 846 and 1160 cm-1. This formation mechanism suggests that a source for this potentially dangerous greenhouse gas might be the recombination of SF5(X2A1) and CF3(X2A1) radicals on aerosol particles in the terrestrial atmosphere.
![Research paper thumbnail of Investigating the Mechanism for the Formation of Nitrous Oxide [N 2 O( X 1 Σ + )] in Extraterrestrial Ices](https://attachments.academia-assets.com/42925715/thumbnails/1.jpg)
](Astrophysical Journal, 2005
The formation of nitrous oxide, N2O(X 1� +), in interstellar space and in ices on Pluto and Trito... more The formation of nitrous oxide, N2O(X 1� +), in interstellar space and in ices on Pluto and Triton has been experimentally investigated. A molecular nitrogen (N2) and carbon dioxide (CO2) ice mixture was irradiated at 10 K with 5 keV electrons to simulate the electronic interaction effects of Galactic cosmic-ray bombardment of extraterrestrialicesamplesoveratimeof5 ;106 yr.BymonitoringtheexperimentwithaFouriertransforminfrared spectrometer on line and in
Astrophysical Journal Supplement Series, 2009
The formation of carbon dioxide from the processing of carbon monoxide (CO) and molecular oxygen ... more The formation of carbon dioxide from the processing of carbon monoxide (CO) and molecular oxygen (¹O) via radiolysis is studied within the context of its formation in interstellar ices in quiescent clouds. With the help of isotopic labeling, we were able to 'trace' the atoms and provide mechanistical information on how carbon monoxide is decomposed, and carbon dioxide is formed
The Astrophysical Journal, 2007
We have investigated the formation of ozone by electron impact in solid molecular oxygen ices bet... more We have investigated the formation of ozone by electron impact in solid molecular oxygen ices between 11 and 30 K. The amount of ozone formed is shown to be strongly dependent on the sample temperature. As the ice temperature increases, the column density of the ozone monomer is found to diminish. This is ascribed to the loss of oxygen atoms by recombination with a neighboring oxygen atom to ''recycle'' molecular oxygen. In the ''warm-up'' phase after irradiation, two additional temperature-dependent reaction mechanisms were observed to synthesize ozone: (1) a reaction of oxygen atoms from a [O 3 . . .O] complex with a neighboring oxygen molecule and (2) a reaction of trapped oxygen atoms with oxygen molecules to yield the ozone monomer. These experiments have important implications to the oxygen chemistry in icy satellites throughout our solar system.
Physical Chemistry Chemical Physics, 2005
Here we report the first experimental detection of the C(s) symmetric nitroformyl radical, OCNO(X... more Here we report the first experimental detection of the C(s) symmetric nitroformyl radical, OCNO(X 2A'') in a nitrogen-carbon dioxide matrix at 10 K using a Fourier transform infrared spectrometer (FTIR). The nu1 vibrational frequency was observed at 2113 cm(-1). This assignment was confirmed by follow-up experiments using isotopically labeled reactant molecules (15N, 18O, 13C). To synthesize this radical, we irradiated solid nitrogen-carbon dioxide ice mixtures with energetic electrons at 10 K. Suprathermal nitrogen atoms in their electronic ground and/or first electronically excited state were generated via the radiation induced degradation of molecular nitrogen; these atoms could then react with carbon dioxide to eventually yield the nitroformyl radical. We also investigated the kinetics of the formation of the nitroformyl radical and support the arguments with computations on the doublet and quartet OCNO potential energy surfaces (PESs).
Geophysical Research Letters, 2015
ABSTRACT The complex dielectric constants of liquids methane and ethane were measured at 90 K and... more ABSTRACT The complex dielectric constants of liquids methane and ethane were measured at 90 K and 14.1 GHz, close to the frequency of the Cassini RADAR. The liquid ethane loss tangent is far greater than that of liquid methane, facilitating discrimination by remote sensing. The results suggest a methane-dominated composition for the northern sea, Ligeia Mare, on the basis of a recent loss tangent determination using Cassini RADAR altimetry. This contrasts a previous far higher loss tangent for the southern lake, Ontario Lacus, which is inconsistent with simple mixtures of methane and ethane. The apparent non-equilibrium methane-to-ethane ratio of Ligeia Mare can be explained by poor admixture of periodically cycled methane with a deeper ethane-rich alkanofer system, consistent with obliquity-driven volatile cycling, sequestration of ethane from the hydrocarbon cycle by incorporation into crustal clathrate hydrates, or periodic flushing of Ligeia Mare into adjacent Kraken Mare by fresh rainfall.
Journal of Geophysical Research Planets, 2014
Hydrated chlorine salts are expected to exist on a variety of planetary bodies, including inner p... more Hydrated chlorine salts are expected to exist on a variety of planetary bodies, including inner planets such as Mars and outer planet satellites such as Europa. However, detection by remote sensing has been limited due to a lack of comparison data in spectral libraries. In addition, at low temperatures spectral features of many H2O-bearing species deviate from their room temperature behavior. Thus, we acquired spectra of NaCl, NaClO4∙nH2O, MgCl2∙nH2O, Mg(ClO4)2∙6H2O, and Mg(ClO3)2∙6H2O from 0.35-2.5 μm at both 298 and 80 K to observe the effects of temperature on diagnostic spectral features. In the NIR, the strongest spectral features often arise from water molecules. Increasing hydration states increases the depth and width of water bands. Interestingly, at low temperature these bands become narrower with sharper, better-defined minima, allowing individual bands to be more easily resolved. We also measured frozen eutectic solutions of NaCl, MgCl2, and KCl. We show that while care must be taken to acquire laboratory spectra of all hydrated phases at the relevant conditions (e.g. temperature, pressure) for the planetary body being studied, chlorine salts do possess distinct spectral features that should allow for their detection by remote sensing.
Inorganic chemistry, Jan 19, 2007
The formation of SF5CF3(X1A'), through the radical-radical recombination of SF5(X2A1) and CF3... more The formation of SF5CF3(X1A'), through the radical-radical recombination of SF5(X2A1) and CF3(X2A1), was observed for the first time in low-temperature sulfur hexafluoride-carbon tetrafluoride matrices at 12 K via infrared spectroscopy upon irradiation of the ices with energetic electrons. The nu1 fundamentals of the SF5(X2A1) and CF3(X2A1) radicals were monitored at 857 and 1110 cm-1, respectively; the newly formed trifluoromethyl sulfur pentafluoride molecule, SF5CF3(X1A'), was detected via its absorptions at 846 and 1160 cm-1. This formation mechanism suggests that a source for this potentially dangerous greenhouse gas might be the recombination of SF5(X2A1) and CF3(X2A1) radicals on aerosol particles in the terrestrial atmosphere.
Astrophysical Journal, 2005
The formation of nitrous oxide, N2O(X 1� +), in interstellar space and in ices on Pluto and Trito... more The formation of nitrous oxide, N2O(X 1� +), in interstellar space and in ices on Pluto and Triton has been experimentally investigated. A molecular nitrogen (N2) and carbon dioxide (CO2) ice mixture was irradiated at 10 K with 5 keV electrons to simulate the electronic interaction effects of Galactic cosmic-ray bombardment of extraterrestrialicesamplesoveratimeof5 ;106 yr.BymonitoringtheexperimentwithaFouriertransforminfrared spectrometer on line and in
Astrophysical Journal Supplement Series, 2009
The formation of carbon dioxide from the processing of carbon monoxide (CO) and molecular oxygen ... more The formation of carbon dioxide from the processing of carbon monoxide (CO) and molecular oxygen (¹O) via radiolysis is studied within the context of its formation in interstellar ices in quiescent clouds. With the help of isotopic labeling, we were able to 'trace' the atoms and provide mechanistical information on how carbon monoxide is decomposed, and carbon dioxide is formed
The Astrophysical Journal, 2007
We have investigated the formation of ozone by electron impact in solid molecular oxygen ices bet... more We have investigated the formation of ozone by electron impact in solid molecular oxygen ices between 11 and 30 K. The amount of ozone formed is shown to be strongly dependent on the sample temperature. As the ice temperature increases, the column density of the ozone monomer is found to diminish. This is ascribed to the loss of oxygen atoms by recombination with a neighboring oxygen atom to ''recycle'' molecular oxygen. In the ''warm-up'' phase after irradiation, two additional temperature-dependent reaction mechanisms were observed to synthesize ozone: (1) a reaction of oxygen atoms from a [O 3 . . .O] complex with a neighboring oxygen molecule and (2) a reaction of trapped oxygen atoms with oxygen molecules to yield the ozone monomer. These experiments have important implications to the oxygen chemistry in icy satellites throughout our solar system.
Physical Chemistry Chemical Physics, 2005
Here we report the first experimental detection of the C(s) symmetric nitroformyl radical, OCNO(X... more Here we report the first experimental detection of the C(s) symmetric nitroformyl radical, OCNO(X 2A'') in a nitrogen-carbon dioxide matrix at 10 K using a Fourier transform infrared spectrometer (FTIR). The nu1 vibrational frequency was observed at 2113 cm(-1). This assignment was confirmed by follow-up experiments using isotopically labeled reactant molecules (15N, 18O, 13C). To synthesize this radical, we irradiated solid nitrogen-carbon dioxide ice mixtures with energetic electrons at 10 K. Suprathermal nitrogen atoms in their electronic ground and/or first electronically excited state were generated via the radiation induced degradation of molecular nitrogen; these atoms could then react with carbon dioxide to eventually yield the nitroformyl radical. We also investigated the kinetics of the formation of the nitroformyl radical and support the arguments with computations on the doublet and quartet OCNO potential energy surfaces (PESs).
Geophysical Research Letters, 2015
ABSTRACT The complex dielectric constants of liquids methane and ethane were measured at 90 K and... more ABSTRACT The complex dielectric constants of liquids methane and ethane were measured at 90 K and 14.1 GHz, close to the frequency of the Cassini RADAR. The liquid ethane loss tangent is far greater than that of liquid methane, facilitating discrimination by remote sensing. The results suggest a methane-dominated composition for the northern sea, Ligeia Mare, on the basis of a recent loss tangent determination using Cassini RADAR altimetry. This contrasts a previous far higher loss tangent for the southern lake, Ontario Lacus, which is inconsistent with simple mixtures of methane and ethane. The apparent non-equilibrium methane-to-ethane ratio of Ligeia Mare can be explained by poor admixture of periodically cycled methane with a deeper ethane-rich alkanofer system, consistent with obliquity-driven volatile cycling, sequestration of ethane from the hydrocarbon cycle by incorporation into crustal clathrate hydrates, or periodic flushing of Ligeia Mare into adjacent Kraken Mare by fresh rainfall.