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 Title: UNTANGLING MOLECULAR SIGNALS OF ASTROCHEMICAL ICES IN THE THz: DISTINGUISHING AMORPHOUS, CRYSTALLINE, AND INTRAMOLECULAR MODES WITH BROADBAND THz SPECTROSCOPY Author(s): McGuire, Brett A. Contributor(s): Blake, Geoffrey; Carroll, Brandon; Allodi, Marco A.; de Vries, Xander; Ioppolo, Sergio Subject(s): Astronomy Abstract: We have previous reported at this meeting on the initial construction of a broadband (0.3 � 7.5 THz) TeraHertz time-domain spectrometer to study condensed-phase samples of astrophysically-relevant species. Here, we present the latest results from this instrument, focusing on the intersection of theory with experiment in the interpretation of our spectra. We will present both simple (CO$_2$) and more complex (CH$_3$OH and beyond) species, in their purely-crystalline and purely-amorphous states, at varying levels of matrix isolation, and as mixtures of these species. We will discuss the relative contributions of individual molecular motions (i.e. torsional modes) and bulk motions within the ice to the observed laboratory spectra. We will also touch upon the feasibility of direct interstellar detection of species from these spectra, and the results of proof-of-concept observations with the FIFI-LS instrument on the SOFIA telescope, currently scheduled for Spring 2015. Issue Date: 25-Jun-15 Publisher: International Symposium on Molecular Spectroscopy Citation Info: ACS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/79195 Date Available in IDEALS: 2016-01-05
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