Chemical changes induced during heating of acetonitrile-rich ice pre-irradiated by X-rays and its implication in astrochemistry

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dc.contributor.authorCarvalho, Geanderson Araújo
dc.contributor.authorPilling, Sergio
dc.date.accessioned2025-04-04T16:30:15Z
dc.date.available2025-04-04T16:30:15Z
dc.date.issued22022
dc.description.abstractIn this work, we investigate the effects induced by the heating of acetonitrile-rich ice from 13 K to 350 K. Before the heating, the sample was irradiated at 13 K by broadband X-rays (6 eV to 2 keV), which trigger the production of new molecules, such as HCN, H2CCNH, CH4 and CH3NC (see Carvalho and Pilling, 2020) and also induced desorption of frozen species to gas-phase. New spectra were collected during heating to investigate whether new species, not present before at lower temperatures, appear due to thermal processing. New infrared bands were identified at temperatures around 120 K and 300 K, from which it was possible to notice the possible presence of HCN/CN radical, ammonia and C2N2. It was also verified that acetonitrile has a thermal desorption peak between 120 K and 200 K, which yields to the vanishing of acetonitrile within the sample for temperatures of 200 K and above. Some infrared features assigned before solely to acetonitrile remain for sample temperatures > 200 K, which indicates the presence of blended species with similar infrared features. From analyzing those blended peaks, we also perceived the possible presence of aminoacetonitrile.
dc.description.physical8 p.
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.uriCNPq (projects #304130/2012–5; #306145/ 2015–4; #302985/2018–2) FAPESP (projects JP 2009/18304–0) CAPES (PNPD/88887.368365/2019–00)
dc.format.mimetypePDF
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.bibliographicCitationCARVALHO, Geanderson Araújo; PILLING, Sergio. Chemical changes induced during heating of acetonitrile-rich ice pre-irradiated by X-rays and its implication in astrochemistry. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, v. 267, p. 1-8, 2022. Disponível em: https://linkinghub.elsevier.com/retrieve/pii/S1386142521010726.
dc.identifier.doi10.1016/j.saa.2021.120495
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/808
dc.language.isoen_US
dc.publisherElsevier
dc.rights.holderSpectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
dc.subject.keywordEnergetic processing
dc.subject.keywordAcetonitrile ice
dc.subject.keywordInfrared Spectroscopy
dc.subject.keywordAstrophysical ices
dc.titleChemical changes induced during heating of acetonitrile-rich ice pre-irradiated by X-rays and its implication in astrochemistry
dc.typeArtigos de Periódicos

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