{"created":"2023-06-20T14:52:18.857429+00:00","id":20445,"links":{},"metadata":{"_buckets":{"deposit":"a232b775-f517-44b6-a936-b410564afc0f"},"_deposit":{"created_by":1,"id":"20445","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"20445"},"status":"published"},"_oai":{"id":"oai:jaxa.repo.nii.ac.jp:00020445","sets":["1543:1778:1789","1887:1891"]},"author_link":["195348","195342","195347","195337","195338","195339","195346","195343","195341","195344","195340","195345"],"item_5_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2007-07-25","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"106","bibliographicPageStart":"102","bibliographic_titles":[{"bibliographic_title":"第40回月・惑星シンポジウム"},{"bibliographic_title":"Proceedings of the 40th ISAS Lunar and Planetary Symposium","bibliographic_titleLang":"en"}]}]},"item_5_description_17":{"attribute_name":"抄録（英）","attribute_value_mlt":[{"subitem_description":"Hydrogen CyaNide (HCN) is one of the most important molecules in the origin of life, and its production processes have been widely studied. However, the production rate of HCN in the early Earth is highly uncertain. Furthermore, it is estimated to be extremely low if the early Earth atmosphere is redox-neutral (i.e., N2-CO2 dominant). We focus on a CN radicals formation process due to hypervelocity oblique impacts as a new HCN production process, because this process may be able to produce HCN efficiently within an N2-CO2 dominant atmosphere. Impact-induced CN radicals may react with water vapor in an ambient atmosphere and generate HCN. However, these chemical reactions between impact-induced CN radicals and an ambient atmosphere have not been understood well. In our previous study, we conducted laser ablation experiments using graphite targets and N2-CO2-H2O-Ar model atmospheres to simulate chemical reactions between impact-induced CN radicals and a redox-neutral atmospheres. We found that laser-induced hot CN radicals convert to HCN efficiently in an ambient atmosphere containing as much as a few hundred mbar of CO2. However, empirical scaling rules on both vapor plume size and impact velocity are necessary to estimate HCN yield on actual impacts within the early Earth atmosphere because both actual and experimental pressure-temperature conditions of CN radicals are very different. Thus, we vary laser beam diameter and intensity to investigate the effects of vapor plume size and impact velocity on the conversion ratio from hot CN radicals to HCN molecules in this study. We found that the conversion ratio increases as beam diameter increases and that it decreases as beam intensity increases (i.e., impact vapor temperature increases). However, previous experiments show that the rate of increase in CN production as a function of impact velocity is higher than the rate of decrease in conversion ratio estimated by our laser experiments. These results strongly suggest that this HCN production process works efficiently on actual asteroidal impacts.","subitem_description_type":"Other"}]},"item_5_description_32":{"attribute_name":"資料番号","attribute_value_mlt":[{"subitem_description":"資料番号: AA0063723025","subitem_description_type":"Other"}]},"item_5_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"宇宙航空研究開発機構宇宙科学研究本部"}]},"item_5_publisher_9":{"attribute_name":"出版者（英）","attribute_value_mlt":[{"subitem_publisher":"Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)"}]},"item_5_text_6":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"東京大学 大学院新領域創成科学研究科"},{"subitem_text_value":"東京大学 大学院理学系研究科"},{"subitem_text_value":"東京大学 大学院新領域創成科学研究科"},{"subitem_text_value":"大阪大学 レーザーエネルギー学研究センター"},{"subitem_text_value":"岡山大学 地球物質科学研究センター"},{"subitem_text_value":"東京大学 大学院新領域創成科学研究科"}]},"item_5_text_7":{"attribute_name":"著者所属（英）","attribute_value_mlt":[{"subitem_text_language":"en","subitem_text_value":"University of Tokyo Graduate School of Frontier Sciences"},{"subitem_text_language":"en","subitem_text_value":"University of Tokyo Graduate School of Science"},{"subitem_text_language":"en","subitem_text_value":"University of Tokyo Graduate School of Frontier Sciences"},{"subitem_text_language":"en","subitem_text_value":"Osaka University Institute of Laser Engineering"},{"subitem_text_language":"en","subitem_text_value":"Okayama University Institute for Study of the Earth's Interior"},{"subitem_text_language":"en","subitem_text_value":"University of Tokyo Graduate School of Frontier Sciences"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"黒澤, 耕介"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"石橋, 高"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"杉田, 精司"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"門野, 敏彦"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"大野, 宗祐"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"松井, 孝典"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Kurosawa, Kosuke","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Ishibashi, Ko","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Sugita, Seiji","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Kadono, Toshihiko","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Ono, Sosuke","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Matsui, Takafumi","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"宇宙探査","subitem_subject_scheme":"Other"},{"subitem_subject":"惑星進化","subitem_subject_scheme":"Other"},{"subitem_subject":"原始地球大気","subitem_subject_scheme":"Other"},{"subitem_subject":"化学反応","subitem_subject_scheme":"Other"},{"subitem_subject":"シアン化水素","subitem_subject_scheme":"Other"},{"subitem_subject":"フリーラジカル","subitem_subject_scheme":"Other"},{"subitem_subject":"超高速衝突","subitem_subject_scheme":"Other"},{"subitem_subject":"レーザーアブレーション","subitem_subject_scheme":"Other"},{"subitem_subject":"space exploration","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"planetary evolution","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"primitive Earth atmosphere","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"chemical reaction","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"hydrogen cyanide","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"free radical","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"hypervelocity impact","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"laser ablation","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"conference paper","resourceuri":"http://purl.org/coar/resource_type/c_5794"}]},"item_title":"HCN formation by chemical reactions between impact-induced hot CN radicals and a redox-neutral atmosphere: The effects of size and velocity of impacts on the conversion ratio from CN to HCN","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"HCN formation by chemical reactions between impact-induced hot CN radicals and a redox-neutral atmosphere: The effects of size and velocity of impacts on the conversion ratio from CN to HCN","subitem_title_language":"en"}]},"item_type_id":"5","owner":"1","path":["1789","1891"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-03-26"},"publish_date":"2015-03-26","publish_status":"0","recid":"20445","relation_version_is_last":true,"title":["HCN formation by chemical reactions between impact-induced hot CN radicals and a redox-neutral atmosphere: The effects of size and velocity of impacts on the conversion ratio from CN to HCN"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-06-21T03:50:08.907861+00:00"}