Department of Electronic Engineering, Centro Federal de Educação Tecnológica Celso Suckow da Fonseca, Avenida Maracanã 229, 20271-110, Rio de Janeiro, Rio de Janeiro, Brazil.
Department of Physics, Centro Federal de Educação Tecnológica Celso Suckow da Fonseca, Avenida Maracanã 229, 20271-110, Rio de Janeiro, Rio de Janeiro, Brazil.
J Phys Chem A. 2022 Mar 31;126(12):2007-2017. doi: 10.1021/acs.jpca.2c00768. Epub 2022 Mar 18.
As of early 2022, only six species bearing an N-O bond have been detected toward cold molecular clouds and regions of star formation. It is not clear yet if the small number of N-O bond species found in the interstellar medium so far stems from physical and technological limitations of astronomical detection techniques, or whether in fact molecules that bear an N-O bond are for some reason rare in these objects of the interstellar medium. Astronomical N-O bearing molecules are important because they are part of astrochemical models which propose that they are precursors of hydroxylamine (NHOH), a species linked to the formation of prebiotic amino acids in space. The aim of this study is the better understanding of the open question of the interstellar synthesis of N-O bearing species. We have analyzed by infrared spectroscopy an astrophysically relevant polar ice mixture of NO:HO processed by 90 MeV Xe ions, which can mimic the physicochemical processes triggered by cosmic rays in water-covered interstellar ice grains. The results show the formation of NO and of HO, but no HN-O species of any kind were detected. Such findings are discussed in light of recent studies from our group and from the literature.
截至 2022 年初，仅在冷分子云和恒星形成区域中检测到六种含有 N-O 键的物质。目前还不清楚迄今为止在星际介质中发现的少量含有 N-O 键的物质是由于天文探测技术的物理和技术限制造成的，还是实际上由于某种原因，含有 N-O 键的分子在星际介质中的这些物体中很罕见。含氮氧的天文分子很重要，因为它们是天体化学模型的一部分，这些模型提出它们是羟胺（NHOH）的前体，羟胺与太空中前生物氨基酸的形成有关。本研究的目的是更好地理解星际合成含氮氧物质的开放性问题。我们通过红外光谱分析了由 90 MeV Xe 离子处理的与天体物理相关的 NO：HO 极性冰混合物，该混合物可以模拟水覆盖的星际冰粒中宇宙射线引发的物理化学过程。结果表明形成了 NO 和 HO，但没有检测到任何类型的 HN-O 物质。这些发现结合我们小组和文献中的最新研究进行了讨论。
