FOTÓLISE DE GELO DE ETANOL POR RAIOS-X E SUAS IMPLICAÇÕES EM AMBIENTES ASTROFÍSICOS


LABORATORY INVESTIGATION OF X-RAY PHOTOLYSIS OF ETHANOL ICE AND ITS IMPLICATION ON ASTROPHYSICAL ENVIRONMENTS

Authors

DOI:

https://doi.org/10.18066/revistaunivap.v29i61.4387

Abstract

Here we present experimental results on the irradiation of ethanol ice (CH3CH2OH) by broadband soft X-rays to simulate the effect processing of organic-rich astrophysical ices by space radiation. This molecule was detected in the interstellar medium in molecular clouds like Sagittarius B2 and towards nebulas like Orion KL. The experiments were performed at the Brazilian Synchrotron Facility LNLS/CNPEM, at Campinas, SP. The frozen sample was analyzed in-situ by infrared spectroscopy (IR) in a simulated astrophysical environment at different radiation fluences. The results show the formation of several new molecular species such as CO2, CO, H2O, CH4, CH3(CO)CH3 (acetone), and CH3COOH (acetic acid). We determined the effective destruction cross-section of ethanol (~1×10-18 cm2) and the formation cross-sections of the daughter species with values between 0.5 to 3.4×10-18 cm2. The chemical equilibrium phase of ice was characterized and desorption yield induced by X-rays was determined (0.13 molecules photon-1). The result helps us to understand the photolysis induced by X-rays in organic-rich ices in space environments.

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Author Biographies

Sergio Pilling, Universidade do Vale do Paraíba - Univap

Sergio Pilling Guapyassu de Oliveira concluiu a graduação em Astronomia pela Universidade Federal do Rio de Janeiro (UFRJ) em 2000, o mestrado em Astronomia pelo Observatório Nacional em 2002 e o doutorado em Físico-Química pela UFRJ em fevereiro de 2006. Foi pós-doutor do Laboratório Nacional de Luz Síncrotron (LNLS), PUC-Rio no laboratório Van der Graaff e no laboratório Ganil-Fr. Publicou mais de 80 artigos em periódicos especializados/ revistas científica. Possui mais de 1000 citações (fator H=20). Atualmente trabalha como professor pesquisador na Universidade do Vale do Paraiba (UNIVAP). Foi coordenador do curso de mestrado do programa de pós-graduação em Física e Astronomia da Univap (2014-2016). Atua nas áreas de Laboratório de Astrofísica ou Astroquímica Experimental, Astrobiologia, Física Experimental e Fisico-Química com ênfase em Espectroscopia Molecular (TOF-MS), Fisica atomica e molecular e Espectroscopia Infravermelho (FTIR). Leciona disciplinas na graduação e na pós-graduação. Orienta alunos de graduação e de pós-graduação. Coordena o Laboratório de Astroquímica e astrobiologia da Univap (LASA), um investimento de mais de um milhão de reais. Além de se dedicar a pesquisa, tem experiência na área de divulgação científica. Foi membro eleito da comissão de organização F3 Astrobiology (2015-2020) da Uniao Astronomica Internacional - IAU.

Fabricio M. Freitas, Universidade do Vale do Paraíba - Univap

Doutor em Física e Astronomia pela Universidade do Vale do Paraíba (2021). Mestre em Física e Astronomia pela UNIVAP (2018). Graduado em Física (Licenciatura Plena) pelo Instituto Superior de Educação - ETEP Faculdades (2006), possui, ainda, graduação em Matemática (Licenciatura Plena) pelo Instituto Superior de Educação - ETEP Faculdades (2009), graduação em Pedagogia (Administração / Direção / Coordenação) pela Universidade Metropolitana de Santos e graduação em Música (Licenciatura Plena) pela Universidade Metropolitana de Santos. Atualmente é professor dos Colégios Univap em São José dos Campos. É, ainda, servidor público (Professor PEB 2 do Estado de São Paulo) desde 2008 e designado como Vice Diretor de escola desde março de 2021 até o presente momento. Tem ampla experiência em Licenciatura em Nível Fundamental, Médio,Técnico e Superior; experiência em Manutenção de Equipamentos Eletrônicos; Conhecimento em interpretação / projetos de Circuitos Analógicos e Sistemas Digitais: Nível Avançado de Inglês e Nível Intermediário de Espanhol.

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Published

2023-03-28

How to Cite

Pilling, S., & Freitas, F. M. (2023). LABORATORY INVESTIGATION OF X-RAY PHOTOLYSIS OF ETHANOL ICE AND ITS IMPLICATION ON ASTROPHYSICAL ENVIRONMENTS. Revista Univap, 29(61). https://doi.org/10.18066/revistaunivap.v29i61.4387

Issue

Vol. 29 No. 61 (2023): Revista Univap

Section

Ciências Exatas e da Terra

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