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The structure and dynamics of carbon dioxide and water containing ices investigated via THz and mid-IR spectroscopy

Allodi, Marco A. and Ioppolo, Sergio and Kelley, Matthew J. and McGuire, Brett A. and Blake, Geoffrey A. (2013) The structure and dynamics of carbon dioxide and water containing ices investigated via THz and mid-IR spectroscopy. Physical Chemistry Chemical Physics, 16 (8). pp. 3442-3455. ISSN 1463-9076. https://resolver.caltech.edu/CaltechAUTHORS:20140109-101228842

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Abstract

Icy dust grains play a key role in the chemistry of the interstellar medium. The cumulative outcome of recent observations, laboratory studies, and astrochemical models indicates that solid-phase reaction mechanisms may dominate the formation of complex organic molecules such as amino acids and sugars in space. Consequently, the composition and structure of the icy grain mantle may significantly influence solid-phase reaction pathways. In this work, we present a new experimental setup capable of studying astrochemical ice analogs in both the TeraHertz (THz), or far-Infrared (far-IR), region (0.3–7.5 THz; 10–250 cm^(−1)) and the mid-IR (400–4000 cm^(−1)). The instruments are capable of performing a variety of spectroscopic studies that can provide especially relevant laboratory data to support astronomical observations from telescopes such as Herschel, SOFIA, and ALMA. Experimental spectra of astrochemical ice analogs of water and carbon dioxide in pure, mixed, and layered ices were collected at different temperatures under high vacuum conditions with the goal of investigating the structure of the ice. We tentatively observe a new feature in both amorphous solid water and crystalline water at 33 cm^(−1) (1 THz). In addition, our studies of mixed and layered ices show how it is possible to identify the location of carbon dioxide as it segregates within the ice by observing its effect on the THz spectrum of water ice. The THz spectra of mixed and layered ices are further analyzed by fitting their spectral features to those of pure amorphous solid water and crystalline water ice to quantify the effects of temperature changes on structure. From the results of this work, it appears that THz spectroscopy is potentially well suited to study thermal transformations within the ice.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1039/c3cp53767fDOIArticle
http://pubs.rsc.org/en/Content/ArticleLanding/2014/CP/c3cp53767fPublisherArticle
ORCID:
AuthorORCID
Allodi, Marco A.0000-0002-3289-1659
Ioppolo, Sergio0000-0002-2271-1781
McGuire, Brett A.0000-0003-1254-4817
Blake, Geoffrey A.0000-0003-0787-1610
Additional Information:© 2014 the Owner Societies. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Received 04 Sep 2013, Accepted 16 Dec 2013; First published online 16 Dec 2013. The authors thank Daniel B. Holland and P. Brandon Carroll for helpful discussions as well as the referees whose comments helped improve the manuscript. This work was supported by the NSF CRIF:ID and CSDM programs and the NASA Exobiology and Laboratory Astrophysics programs. M.A.A thanks Katie Kirby for proofreading help, and was supported by the Department of Defense (DoD) Air Force Office of Scientific Research, National Defense Science and Engineering Graduate (NDSEG) Fellowship, 32 CFR 168a. S.I. acknowledges support from a Niels Stensen Fellowship and a Marie Curie Fellowship (FP7-PEOPLE-2011-IOF-300957). B.A.M. gratefully acknowledges funding by an NSF Graduate Research Fellowship.
Funders:
Funding AgencyGrant Number
NSFUNSPECIFIED
NASAUNSPECIFIED
Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
National Defense Science and Engineering Graduate (NDSEG) Fellowship32 CFR 168a
Niels Stensen FellowshipUNSPECIFIED
Marie Curie FellowshipFP7-PEOPLE-2011-IOF-300957
NSF Graduate Research FellowshipUNSPECIFIED
Subject Keywords:astrochemistry
Issue or Number:8
Record Number:CaltechAUTHORS:20140109-101228842
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140109-101228842
Official Citation:Allodi, M. A., Ioppolo, S., Kelley, M. J., McGuire, B. A., & Blake, G. A. (2014). The structure and dynamics of carbon dioxide and water containing ices investigated via THz and mid-IR spectroscopy. Physical Chemistry Chemical Physics, 16(8), 3442-3455. doi: 10.1039/c3cp53767f
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43291
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Jan 2014 22:23
Last Modified:09 Mar 2020 13:18

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