JCJC SIMI 8 - JCJC - SIMI 8 - Chimie du solide, colloïdes, physicochimie

Volatile Analysis from the Heating of Interstellar Ice Analogs – VAHIIA

VAHIIA

Volatile Analysis from the Heating of Interstellar Ice Analogs

Implementation of the device and Post-Doc recruitment

1 - Post-doc recruitment Dr. Ninette BELLES-LIMEUL (Abou Mrad) (06/2013). <br />2 - GC-MS Delivery (07/2013). <br />3 - Interface implementation between cryostat and GC-MS (09/2004). <br />4 - GC-MS Calibration (02/2014). <br />5 - Calibration of the VAHIIA interface (02/2014).

The VAHIIA interface consists of two units. One is the preconcentration unit which allows the VOC preconcentration and their transfert to the GC injection unit after reaching an suitable pressure. This second unit allows the injection of VOC in gas phase. this VAHIIA system allows the recovery of VOC sublimating in a vacuum chamber (10-9 mbar) with times ranging from several minutes to several hours and provides their online analysis by GC-MS device.

The VAHIIA interface has been validated and calibrated. The repeatability of the injection is about 13% and the detection limits around nanomoles. The transfer of VOC standards from the vacuum chamber to the GC-MS was performed and validated without any problems.

We are developing analytical protocols (columns, temperature programs ...) for separation by GC-MS of a maximum number of species in a single injection. We currently work in electron impact ionization and we will investigate chemical ionization. This is an essential step because in the analysis of VOC from interstellar or cometary ice, the VOC identification will be one of the crucial points, and chemical ionization should be able to help us at this stage.
In early September, we will apply the developed VOCs analysis to the Strecker reaction that allows the formation of aminonitrile inside cometary ices, these aminonitriles being precursor of amino acids. At the end of 2014, we plan to test our system on real interstellar and cometary ice analogs.

Publications:
1. Formation of hydroxyacetonitrile (HOCH2CN) and polyoxymethylene (POM)-derivatives in comets from formaldehyde (CH2O) and hydrogen cyanide (HCN) activated by water” G. Danger, A. Rimola, N. Abou Mrad, F. Duvernay, G. Roussin, P. Theule and T. Chiavassa, Physical Chemistry Chemical Physics 16 (2014) 3360-3370
2. Development and optimization of an analytical system for the Volatile organic compounds Analysis coming from the Heating of Interstellar/cometary Ice Analogs (VAHIIA), Ninette Abou Mrad, Fabrice Duvernay, Patrice Theulé, Thierry Chiavassa and Grégoire Danger, Analytical Chemistry (2014), major revision

6 oral communications:

The challenges of this project consist in simulating through laboratory experiments, the chemical evolution of interstellar ices, and grains to understand the evolution of the organic matter during the life cycle of interstellar grains. Currently, our team is developing two complementary approaches to study this evolution. First, we are investigating the chemical reactivity that can occur within analogs of pristine or cometary ices, by working on small size systems (two or three reactants). Second, we are investigating the characterization of refractory residues formed during photolysis and warming of ice analogs without any degradation using an orbitrap apparatus. We propose to develop a new approach, which consists in implementing an analytical system for the Volatile Analyses coming from the Heating of Interstellar Ice Analogs, the VAHIIA project. This new device will help us to get a better understanding of the chemical reactions that lead to the formation of refractory residues. It will also give crucial information on species that would sublimate during the warming of cometary nucleus. This system will consist in coupling to an ultra-high vacuum cryogenic system, a gas chromatography including a mass spectrometer in order to analyze gas species sublimating during the heating of ice analogs. Therefore, the VAHIIA project will be the missing link between the two existing projects, and the whole will provide a comprehensive experimental approach aiming to trace the chemical history of such analogs by studying the reactivity of ice at low temperature, analyzing the volatile species sublimating during the warming, and characterizing the non-volatile residues resulting from the latter. The VAHIIA project has been already submitted in 2011. The scientific program of the 2012 application is quite the same that of the previous application. The major modifications are present in the description by tasks of this application, and in the request resources. We call such funding for the purchase of the GC-MS device, and for a two years recruitment of a post-doctor, which objectives will be to participate in GC-MS development and analysis . Furthermore, a detail reply to the “retour au coordinateur” is given in section 3 of the annex document.

Project coordination

Grégoire DANGER (Laboratoire de Physique des Interactions Ioniques et Moléculaires) – gregoire.danger@univ-amu.fr

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

PIIM Laboratoire de Physique des Interactions Ioniques et Moléculaires

Help of the ANR 247,520 euros
Beginning and duration of the scientific project: December 2012 - 36 Months

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