Isotopic compositions, nitrogen functional chemistry, and low‐loss electron spectroscopy of complex organic aggregates at the nanometer scale in the carbonaceous chondrite Renazzo
Isotopic compositions, nitrogen functional chemistry, and low‐loss electron spectroscopy of complex organic aggregates at the nanometer scale in the carbonaceous chondrite Renazzo
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碳质球粒陨石 Renazzo 纳米级复杂有机聚集体的同位素组成、氮功能化学和低损耗电子能谱
DOI：
10.1111/maps.13389
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发表时间：
2020
影响因子：
2.2
通讯作者：
Hoppe P.
中科院分区：
文献类型：
--
作者：
Vollmer C;Leitner J;Kepaptsoglou D;Ramasse Q. M;Busemann H.;Hoppe P.
有机质(OM)广泛存在于早期的太阳星云中，可能在将益生菌分子输送到早期地球的过程中发挥了重要作用。用高空间分辨技术(电子显微镜-二次离子质谱仪)研究了Renazzo碳质球粒陨石中有机颗粒的结构、同位素组成和功能化学。在亚微米尺度上，形态是复杂的，一些有机物表现出明显的纹理，OM和矿物层交替。这些层状有机质还具有15N同位素丰度不均一的特点。用电子能量损失谱对五个聚焦离子束引出的片层进行了功能化学研究，揭示了纳米尺度上的化学复杂性。由于多环芳烃、不同的碳氧以及不同强度的脂肪键环境，颗粒在285、286.6、287和288.6 eV的C-K边表现出吸收。三个颗粒的氮K边功能化学是高度复杂的，我们看到了胺(C-NHx)或酰胺(CO-NR2)化学的迹象，以及可能的N-杂环和硝基。我们还进行了高能量分辨率的低损耗振动光谱，并从拉曼光谱中识别出可能的D-和G-带，和/或从红外光谱中识别出能量损失约为0.17和0.2 eV的C=C和C-O伸缩模式的吸收。多球状层状有机聚集体的观察，非均一的15N-异常组成，以及NHx-(胺)功能化学的指示支持了最近的观点，即富含15N的氨(NH3)是在小行星环境中合成更复杂有机物的强大助剂。
Organic matter (OM) was widespread in the early solar nebula and might have played an important role for the delivery of prebiotic molecules to the early Earth. We investigated the textures, isotopic compositions, and functional chemistries of organic grains in the Renazzo carbonaceous chondrite by combined high spatial resolution techniques (electron microscopy–secondary ion mass spectrometry). Morphologies are complex on a submicrometer scale, and some organics exhibit a distinct texture with alternating layers of OM and minerals. These layered organics are also characterized by heterogeneous15N isotopic abundances. Functional chemistry investigations of five focused ion beam‐extracted lamellae by electron energy loss spectroscopy reveal a chemical complexity on a nanometer scale. Grains show absorption at the C‐K edge at 285, 286.6, 287, and 288.6 eV due to polyaromatic hydrocarbons, different carbon‐oxygen, and aliphatic bonding environments with varying intensity. The nitrogen K‐edge functional chemistry of three grains is shown to be highly complex, and we see indications of amine (C‐NHx) or amide (CO‐NR2) chemistry as well as possible N‐heterocycles and nitro groups. We also performed low‐loss vibrational spectroscopy with high energy resolution and identified possible D‐ and G‐bands known from Raman spectroscopy and/or absorption from C=C and C‐O stretch modes known from infrared spectroscopy at around 0.17 and 0.2 eV energy loss. The observation of multiglobular layered organic aggregates, heterogeneous15N‐anomalous compositions, and indication of NHx‐(amine) functional chemistry lends support to recent ideas that15N‐enriched ammonia (NH3) was a powerful agent to synthesize more complex organics in aqueous asteroidal environments.
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影响因子：
3.7
作者：
R. Nicholls;F. Hage;D. McCulloch;Q. Ramasse;K. Refson;J. Yates
通讯作者：
R. Nicholls;F. Hage;D. McCulloch;Q. Ramasse;K. Refson;J. Yates
影响因子：
4.5
作者：
Z. Martins
通讯作者：
Z. Martins
通往早期地球的氮减少之路：宇宙轨迹及其太阳捷径
DOI：
10.1088/0004-637x/814/2/107
发表时间：
2015
期刊：
The Astrophysical Journal
影响因子：
--
作者：
S. Pizzarello;M. Bose
通讯作者：
M. Bose
Paris 与 Murchison：热液蚀变对 CM 球粒陨石中有机质的影响
影响因子：
5
作者：
V. Vinogradoff;C. Guillou;S. Bernard;L. Binet;P. Cartigny;A. Brearley;L. Remusat
通讯作者：
L. Remusat
原始太阳系物质中的同位素异常：星际云中氮和氘的自旋态相关分馏
DOI：
10.1088/2041-8205/757/1/l11
发表时间：
2012
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
E. Wirström;S. Charnley;M. Cordiner;S. Milam
通讯作者：
S. Milam