Cosmic-ray-induced chemical processes in CH3OH, CH3NH2, and CH3OH:CH3NH2 ices

IF 5.4 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astronomy & Astrophysics Pub Date : 2024-12-17 DOI:10.1051/0004-6361/202452170
Barbara Keresztes, Sándor Góbi, Anita Schneiker, Gábor Bazsó, György Tarczay
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Abstract

Aims. Icy mantles on interstellar dust grains are considered key contributors to the chemical complexity of the interstellar medium (ISM). Gas-phase molecules in the ISM can adsorb onto these icy surfaces, where chemical reactions can be induced by ultraviolet (UV) or cosmic ray (CR) irradiation. The resulting molecules can subsequently desorb, thereby altering the composition of the gas phase in the ISM. Therefore, studying astrochemically relevant reactions within ices is essential for advancing our understanding of astrochemistry.Methods. We conducted experiments with pure methanol (CH3OH), pure methylamine (CH3NH2), and CH3OH:CH3NH2 ices. To simulate CR effects, ices were irradiated with 5 keV electrons. We integrated the advantages of ice experiments and noble gas matrix experiments by performing two distinct investigations on each sample. During temperature-programmed desorption (TPD), chemical changes in the ice samples were monitored using Fourier transform infrared (FTIR) spectroscopy. In addition, the desorbing molecules were trapped in an Ar matrix through a following experiment. This TPD-matrix-isolation (TPD-MI) redeposition process enabled FTIR spectroscopic identification of the desorbed species.Results. The results obtained from experiments with CH3OH and CH3NH2 ices are consistent with previous studies. Additionally, the TPD-MI redeposition process enabled the identification of several species previously not detected clearly and directly in pure CH3OH or CH3NH2 ices, including molecules such as HCOOH, HCN, and CH2CHNH. Our experiments with CH3OH:CH3NH2 mixtures revealed the formation of several nitrogen- and oxygen-containing organic species (CH3NHCH2OH, NH2CH2OH, NH2CH2CH2OH, and HNCO), which are potential precursors to prebiotic molecules in the ISM. Therefore, these experiments provide valuable insights into the chemical evolution in space.
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宇宙射线诱导的CH3OH、CH3NH2和CH3OH:CH3NH2冰的化学过程
星际尘粒上的冰幔被认为是星际介质(ISM)化学复杂性的关键因素。星际介质中的气相分子可以吸附在这些冰表面上,在紫外线(UV)或宇宙射线(CR)辐照的诱导下发生化学反应。由此产生的分子随后可以解吸,从而改变 ISM 中气相的组成。因此,研究冰内与天体化学相关的反应对于加深我们对天体化学的理解至关重要。我们用纯甲醇(CH3OH)、纯甲胺(CH3NH2)和 CH3OH:CH3NH2 冰进行了实验。为了模拟 CR 效应,我们用 5 keV 电子照射冰。我们综合了冰实验和惰性气体基质实验的优势,对每个样品进行了两种不同的研究。在温度编程解吸(TPD)过程中,我们使用傅立叶变换红外(FTIR)光谱监测冰样品的化学变化。此外,在接下来的实验中,解吸分子被困在一个 Ar 基质中。这种 TPD-基质-分离(TPD-MI)再沉积过程可通过傅立叶变换红外光谱鉴定解吸物种。CH3OH 和 CH3NH2 冰的实验结果与之前的研究结果一致。此外,TPD-MI 重沉积过程还能鉴定出一些以前在纯 CH3OH 或 CH3NH2 冰中无法直接清晰检测到的物种,包括 HCOOH、HCN 和 CH2CHNH 等分子。我们对 CH3OH:CH3NH2 混合物的实验揭示了几种含氮和含氧有机物(CH3NHCH2OH、NH2CH2OH、NH2CH2CH2OH 和 HNCO)的形成,这些有机物是 ISM 中前生物分子的潜在前体。因此,这些实验为了解太空中的化学演变提供了宝贵的信息。
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来源期刊
Astronomy & Astrophysics
Astronomy & Astrophysics 地学天文-天文与天体物理
CiteScore
10.20
自引率
27.70%
发文量
2105
审稿时长
1-2 weeks
期刊介绍: Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.
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