{"id":20547,"date":"2019-10-11T12:28:34","date_gmt":"2019-10-11T10:28:34","guid":{"rendered":"http:\/\/karmaka.de\/?p=20547"},"modified":"2019-10-11T12:28:35","modified_gmt":"2019-10-11T10:28:35","slug":"isotopic-compositions-nitrogen-functional-chemistry-and-low%e2%80%90loss-electron-spectroscopy-of-complex-organic-aggregates-at-the-nanometer-scale-in-the-carbonaceous-chondrite-renazzo","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=20547","title":{"rendered":"Isotopic compositions, nitrogen functional chemistry, and low\u2010loss electron spectroscopy of complex organic aggregates at the nanometer scale in the carbonaceous chondrite Renazzo<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Christian Vollmer, Jan Leitner, Demie Kepaptsoglou, Quentin M. Ramasse, Henner Busemann, Peter Hoppe <\/p>\n\n\n\n<p>Meteoritics &amp; Planetary Science <br>\nFirst published: 10 October 2019<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1111\/maps.13389\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br>\n<a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.13389\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;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\u2013secondary 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 heterogeneous 15N isotopic abundances. Functional chemistry investigations of five focused ion beam\u2010extracted lamellae by electron energy loss spectroscopy reveal a chemical complexity on a nanometer scale. Grains show absorption at the C\u2010K edge at 285, 286.6, 287, and 288.6 eV due to polyaromatic hydrocarbons, different carbon\u2010oxygen, and aliphatic bonding environments with varying intensity. The nitrogen K\u2010edge functional chemistry of three grains is shown to be highly complex, and we see indications of amine (C\u2010NHx) or amide (CO\u2010NR2) chemistry as well as possible N\u2010heterocycles and nitro groups. We also performed low\u2010loss vibrational spectroscopy with high energy resolution and identified possible D\u2010 and G\u2010bands known from Raman spectroscopy and\/or absorption from C=C and C\u2010O stretch modes known from infrared spectroscopy at around 0.17 and 0.2 eV energy loss. The observation of multiglobular layered organic aggregates, heterogeneous 15N\u2010anomalous compositions, and indication of NHx\u2010(amine) functional chemistry lends support to recent ideas that 15N\u2010enriched ammonia (NH3) was a powerful agent to synthesize more complex organics in aqueous asteroidal environments.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Christian Vollmer, Jan Leitner, Demie Kepaptsoglou, Quentin M. Ramasse, Henner Busemann, Peter Hoppe Meteoritics &amp; Planetary Science First published: 10 October 2019 LINK (OPEN ACCESS) PDF (OPEN ACCESS) &#8220;Organic matter (OM) was widespread in the&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,12,576],"tags":[542,2231,3273,1989,361],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20547"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=20547"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20547\/revisions"}],"predecessor-version":[{"id":20548,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20547\/revisions\/20548"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20547"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20547"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20547"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}