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Type: Artigo de periódico
Title: The rule of synchrotron radiation in the prebiotic evolution
Author: de Brito, AN
da Silva, AM
Mocellin, A
Abstract: Synchrotron radiation-based spectroscopic techniques are discussed. Their relevance to obtain information regarding the prebiotic evolution problem is pointed out. We present photoelectron-photoion coincidence (PEPICO) spectra of adenine and glycine obtained using 12 and 21 eV photons. The fragmentation pattern belonging to these molecules was found to present striking differences, which are discussed. Adenine partial ion yield in the energy region 12-21 eV is also presented. The neutral fragments were found to have very simple assignment. The importance of hydrogen cyanide (HCN) as a building block of these molecules is confirmed. A special instrumentation allowing precise comparisons between photon-induced desorption and energetic ion bombardment desorption is described. As an example, we show, for the first time, the frozen CO2 ice mass spectra bombarded by photons and energetic ions, under the same experimental conditions. The comparison shows that prebiotic evolution may only be properly understood if more than one particle, as energy source, is considered. Received 16 February 2012, accepted 14 May 2012, first published online 5 July 2012
Subject: adenine
Plasma desorption mass spectroscopy
Partial ion yield
Country: EUA
Editor: Cambridge Univ Press
Rights: embargo
Identifier DOI: 10.1017/S1473550412000213
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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