Search Results - "Gerakines, P. A."

Gas-phase Ortho-to-para Ratio of Formaldehyde Formed at Low Temperatures in Laboratory Ices by Yocum, K. M., Wilkins, O. H., Bardwell, J. C., Milam, S. N., Gerakines, P. A.

“…Abstract The ortho-to-para ratio (OPR) of formaldehyde (H 2 CO) has been used as a probe to estimate the formation temperature of molecules in interstellar,…”
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The Abundance of Carbon Dioxide Ice in the Quiescent Intracloud Medium by Whittet, D. C. B, Shenoy, S. S, Bergin, E. A, Chiar, J. E, Gerakines, P. A, Gibb, E. L, Melnick, G. J, Neufeld, D. A

“…We present new observations with the Infrared Spectrograph on board the Spitzer Space Telescope of the solid-CO sub(2) absorption feature near 15 km in the…”
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Interstellar Extinction and Polarization in the Taurus Dark Clouds: The Optical Properties of Dust near the Diffuse/Dense Cloud Interface by Whittet, D. C. B, Gerakines, P. A, Hough, J. H, Shenoy, S. S

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The Strengths of Near-Infrared Absorption Features Relevant to Interstellar and Planetary Ices by Gerakines, P. A, Bray, J. J, Davis, A, Richey, C. R

“…The abundances of ices in planetary environments have historically been obtained through measurements of near-infrared absorption features ( lambda = 1.0-2.5…”
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Ultraviolet photolysis and proton irradiation of astrophysical ice analogs containing hydrogen cyanide by Gerakines, P.A., Moore, M.H., Hudson, R.L.

“…Hydrogen cyanide (HCN) has been identified in the gas phase of the interstellar medium as well as in the comae of several comets. Terrestrially, HCN is a key…”
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An Inventory of Interstellar Ices toward the Embedded Protostar W33A by Gibb, E. L, Whittet, D. C. B, Schutte, W. A, Boogert, A. C. A, Chiar, J. E, Ehrenfreund, P, Gerakines, P. A, Keane, J. V, Tielens, A. G. G. M, van Dishoeck, E. F, Kerkhof, O

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Energetic processing of laboratory ice analogs: UV photolysis versus ion bombardment by Gerakines, P. A., Moore, M. H., Hudson, R. L.

“…We have the ability to perform both ultraviolet (UV) photolysis (primarily Lyman‐α photons, average E ≈ 10.2 eV per photon) and ion irradiation (protons, E =…”
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The Formation of Cyanate Ion (OCN–) in Interstellar Ice Analogs by Hudson, R. L, Moore, M. H, Gerakines, P. A

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Infrared spectra and optical constants of astronomical ices: II. Ethane and ethylene by Hudson, R.L., Gerakines, P.A., Moore, M.H.

“…•Mid- and near-IR spectra were measured for ethane and ethylene ices at 10–60K.•Refractive indices for each ice’s phases were measured at a specific…”
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Solid Carbon Dioxide in Regions of Low-Mass Star Formation by Nummelin, A, Whittet, D. C. B, Gibb, E. L, Gerakines, P. A, Chiar, J. E

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THE EFFECTS OF EXPERIMENTAL CONDITIONS ON THE REFRACTIVE INDEX AND DENSITY OF LOW-TEMPERATURE ICES: SOLID CARBON DIOXIDE by Loeffler, M. J., Moore, M. H., Gerakines, P. A.

“…ABSTRACT We present the first study on the effects of the deposition technique on the measurements of the visible refractive index and the density of a…”
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Photoelectric Emission Measurements on the Analogs of Individual Cosmic Dust Grains by Abbas, M. M, Tankosic, D, Craven, P. D, Spann, J. F, LeClair, A, West, E. A, Weingartner, J. C, Tielens, A. G. G. M, Nuth, J. A, Camata, R. P, Gerakines, P. A

“…The photoelectric emission process is considered to be the dominant mechanism for charging of cosmic dust grains in many astrophysical environments. The grain…”
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Sublimation of Laboratory Ices Millimeter/Submillimeter Experiment (SubLIME): Structure-specific Identifications of Products from UV-photolyzed Methanol Ice by Yocum, K. M., Milam, S. N., Gerakines, P. A., Widicus Weaver, S. L.

“…Submillimeter/far-IR spectroscopy was used to detect and quantify organic molecules sublimated after the ultraviolet photolysis (at 12 K) and warm-up (up to…”
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The Nature of Carbon Dioxide Bearing Ices in Quiescent Molecular Clouds by Whittet, D. C. B, Cook, A. M, Chiar, J. E, Pendleton, Y. J, Shenoy, S. S, Gerakines, P. A

“…The properties of the ices that form in dense molecular clouds represent an important set of initial conditions in the evolution of interstellar and…”
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Processing of Icy Mantles in Protostellar Envelopes by Chiar, J. E, Gerakines, P. A, Whittet, D. C. B, Pendleton, Y. J, Tielens, A. G. G. M, Adamson, A. J, Boogert, A. C. A

“…We have obtained CO absorption profiles of several young stellar objects (YSOs), spanning a range of mass and luminosity, in order to investigate their ice…”
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Carbon Suboxide in Astrophysical Ice Analogs by Gerakines, P.A., Moore, M.H.

“…As suggested by W. T. Huntress et al. (1991, Nature 352, 316–318), carbon suboxide (C 3O 2) is a potential extended source of both the CO and atomic carbon…”
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Fully Sampled Maps of Ices and Silicates in Front of Cepheus A East with the Spitzer Space Telescope by Sonnentrucker, P, Neufeld, D. A, Gerakines, P. A, Bergin, E. A, Melnick, G. J, Forrest, W. J, Pipher, J. L, Whittet, D. C. B

“…We report the first fully sampled maps of the distribution of interstellar CO sub(2) ices, H sub(2)O ices, and total hydrogen nuclei, as inferred from the 9.7…”
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Mid- and far-infrared spectroscopic studies of the influence of temperature, ultraviolet photolysis and ion irradiation on cosmic-type ices by Moore, M.H, Hudson, R.L, Gerakines, P.A

“…Infrared (IR) studies of laboratory ices can provide information on the evolution of cosmic-type ices as a function of different simulated space environments…”
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NEAR-INFRARED BAND STRENGTHS OF MOLECULES DILUTED IN N2 AND H2O ICE MIXTURES RELEVANT TO INTERSTELLAR AND PLANETARY ICES by RICHEY, C. R, GERAKINES, P. A

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Detection of Abundant CO2 Ice in the Quiescent Dark Cloud Medium toward Elias 16 by Whittet, D. C. B, Gerakines, P. A, Tielens, A. G. G. M, Adamson, A. J, Boogert, A. C. A, Chiar, J. E, de Graauw, Th, Ehrenfreund, P, Prusti, T, Schutte, W. A, Vandenbussche, B, van Dishoeck, E. F

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