Millimeter/Submillimeter Spectroscopic Detection of Desorbed Ices: A New Technique in Laboratory Astrochemistry
Autor: | Ethan Todd, K. M. Yocum, Perry A. Gerakines, Leslie Mora, Houston H. Smith, Susanna L. Widicus Weaver, Stefanie N. Milam |
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Rok vydání: | 2019 |
Předmět: |
Astrochemistry
010304 chemical physics Chemistry Enthalpy Analytical chemistry 010402 general chemistry Mass spectrometry 01 natural sciences Spectral line 0104 chemical sciences 0103 physical sciences Millimeter Rotational spectroscopy Spectroscopic detection Physical and Theoretical Chemistry Spectroscopy |
Zdroj: | The journal of physical chemistry. A. 123(40) |
ISSN: | 1520-5215 |
Popis: | A new laboratory technique has been developed that utilizes gas-phase, direct-absorption millimeter and submillimeter spectroscopy to detect and identify desorbed species from interstellar and cometary ice analogues. Rotational spectroscopy is a powerful structure-specific technique for detecting isomers and other species possessing the same mass that are indistinguishable with mass spectrometry. Furthermore, the resultant laboratory spectra are directly comparable to observational data from far-infrared and millimeter telescopes. Here, we present the proof-of-concept measurements of the detection of thermally desorbed H2O, D2O, and CH3OH originating in a solid film created at low temperature (∼12 K). The surface binding energy of H2O is reported and compared to results from traditional techniques, including mass spectrometry and quartz-crystal microbalance measurements of mass loss. Lastly, we demonstrate that this technique can be used to derive thermodynamic values including the sublimation enthalpy and entropy of H2O. |
Databáze: | OpenAIRE |
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