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On the prospective detection of polyoxymethylene in comet 67P/Churyumov-Gerasimenko with the COSIMA instrument onboard Rosetta

机译:关于使用Rosetta上的COSIMA仪器对67P / Churyumov-Gerasimenko彗星中的聚甲醛进行前瞻性检测

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摘要

The presence of polyoxymethylene (POM) in cometary grains has been debated years ago. Although never proven, its presence can not be excluded. Rosetta, the ESA mission to comet 67P/ChuryumovGerasimenko, may answer this question. On board the spacecraft, COSIMA (COmetary Secondary Ion Mass Analyzer) will analyze the grains ejected from the nucleus using a Time Of Flight Secondary Ion Mass Spectrometer (TOF-SIMS). In this paper we report the extent to which COSIMA will be able to detect POM if this compound is present on cometary grains. We have analyzed two kinds of POM polymers with a laboratory model of COSIMA. Positive mass spectra display alternating sequence of peaks with a separation of 30.011 Da between 1 and 600 Da related to formaldehyde and its oligomers but also to the fragmentation of these oligomers. The separation of 30.011 Da of numbers peaks, corresponding to the fragmentation into H_2CO is characteristic of POM and we show that it could be highlight by mathematical treatment. POM lifetime on COSIMA targets have also been studied as POM is thermally instable. It can be concluded that the cometary grains analysis have to be planned not too long after their collection in order to maximize the chances to detect POM. This work was supported by the Centre National d'Etudes Spatiales (CNES).
机译:几年前,在彗星谷物中存在聚甲醛(POM)的争论。尽管从未得到证实,但不能排除它的存在。欧空局67P / ChuryumovGerasimenko彗星的罗塞塔号可能会回答这个问题。在航天器上,COSIMA(准次级离子质量分析仪)将使用飞行时间次级离子质谱仪(TOF-SIMS)分析从核中喷出的颗粒。在本文中,我们报告了如果彗星谷物中存在这种化合物,COSIMA能够检测到POM的程度。我们用COSIMA的实验室模型分析了两种POM聚合物。正质谱图显示峰的交替序列,与甲醛及其低聚物有关,而且与这些低聚物的断裂有关,在1和600 Da之间有30.011 Da的间隔。 POM的特征是分离出30.011 Da的数字峰,这对应于H_2CO的碎片化,我们证明了它可以通过数学处理来突出显示。由于POM热不稳定,因此还研究了COSIMA目标上的POM寿命。可以得出结论,为了最大程度地检测到POM,必须对彗星颗粒的分析在收集后不久计划。这项工作得到了国家练习曲空间中心(CNES)的支持。

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  • 来源
    《Planetary and space science》 |2012年第1期|p.83-92|共10页
  • 作者单位

    Laboratoire de Physique et Chimie de I'Environnement et de I'Espace (LPC2E), UMR 6115 CNRS - Universite d'Orleans, 3A Avenue de la Recherche Scientifique, 45071 Orleans Cedex 2, France,Laboratoire Interuniversitaire des Systemes Atmospheriques, LISA, UMR CNRS 7583, Universite Paris Est Creteil et Universite Paris Diderot, Institut Pierre Simon Laplace, 61 Avenue du General De Gaulle, 94010 Creteil Cedex, France;

    Laboratoire Interuniversitaire des Systemes Atmospheriques, LISA, UMR CNRS 7583, Universite Paris Est Creteil et Universite Paris Diderot, Institut Pierre Simon Laplace, 61 Avenue du General De Gaulle, 94010 Creteil Cedex, France,Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse (CSNSM), UMR 8609, Universite Paris Sud/CNRS, Bat. 104, F-91405 Orsay Campus, France;

    Laboratoire de Physique et Chimie de I'Environnement et de I'Espace (LPC2E), UMR 6115 CNRS - Universite d'Orleans, 3A Avenue de la Recherche Scientifique, 45071 Orleans Cedex 2, France;

    Laboratoire Interuniversitaire des Systemes Atmospheriques, LISA, UMR CNRS 7583, Universite Paris Est Creteil et Universite Paris Diderot, Institut Pierre Simon Laplace, 61 Avenue du General De Gaulle, 94010 Creteil Cedex, France;

    Laboratoire Interuniversitaire des Systemes Atmospheriques, LISA, UMR CNRS 7583, Universite Paris Est Creteil et Universite Paris Diderot, Institut Pierre Simon Laplace, 61 Avenue du General De Gaulle, 94010 Creteil Cedex, France;

    Laboratoire de Physique et Chimie de I'Environnement et de I'Espace (LPC2E), UMR 6115 CNRS - Universite d'Orleans, 3A Avenue de la Recherche Scientifique, 45071 Orleans Cedex 2, France;

    Laboratoire de Physique et Chimie de I'Environnement et de I'Espace (LPC2E), UMR 6115 CNRS - Universite d'Orleans, 3A Avenue de la Recherche Scientifique, 45071 Orleans Cedex 2, France;

    Max Planck Institute for Solar System Research (MPS), Max-Plank-Str. 2,37191 Katlenburg-Lindau, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    polyoxymethylene; cometary grains; COSIMA; rosetta; TOF SIMS;

    机译:聚甲醛彗星谷物COSIMA;罗塞塔TOF SIMS;

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