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HIGH RESOLUTION SPECTROSCOPY OF HEXAMETHYLENETETRAMINE (HMT) C$_{6}$N$_4$H$_{12}$

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Title: HIGH RESOLUTION SPECTROSCOPY OF HEXAMETHYLENETETRAMINE (HMT) C$_{6}$N$_4$H$_{12}$
Creators: Boudon, V.; Pirali, O.
Issue Date: 2012
Publisher: Ohio State University
Abstract: Hexamethylenetetramine, or HMT (C$_{6}$N$_4$H$_{12}$) is a N-substituted derivative of adamantane C$_{10}$H$_{16}$ which is the smallest sample of the diamondoid molecules family. Thanks to their high stability, diamond-like molecules have long been suspected to be present in space, 160 (1969)} (note that diamond nanocrystals are extracted from Murchinson meteorites, 160 (1987)}), and HMT is known to be an abundant residue of UV irradiated ice analogs, 327 (1995)} and might be present in Titan's atmosphere. Using the Bruker IFS 125 coupled to a multipass cell (absorption path length of 150 m) of the AILES beamline at SOLEIL, we recorded the IR spectrum of gas phase HMT in the 300--3000 cm$^{-1}$ spectral region with an unapodized resolution 0.001 cm$^{-1}$. HMT is a solid powder with about 0.008 mbar vapour pressure at room temperature, it is a $T_d$ molecule (as adamantane) and has 25 vibrational modes from which only 9 are infrared active. Over the 9 IR active modes, we were able to rotationlly resolved the spectra of 6 of them. The analysis of all the resolved bands has been performed thanks to the XTDS and SPVIEW softwares developed in Dijon for such molecules, {\bf 251} 102--113 (2008).}. Each band can be considered as isolated and we get very good fits of line positions, with a root mean square deviation better than $5\times 10^{-4}$ cm$^{-1}$ for $J$ values up to 80 or more in each case. As for our recent study concerning adamantane, 024310 (2012)}, the resulting synthetic spectra will permit an active search of this very stable specie in different sources of the interstellar medium.
Description: Author Institution: Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS-Universite de Bourgogne, 9. Av. A. Savary, BP 47870, F-21078 Dijon Cedex, France; Ligne AILES -- Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Gif-sur-Yvette, France
URI: http://hdl.handle.net/1811/52232
Other Identifiers: 2012-RC-10
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