Secondary ion emission induced by fission fragment impact in CONH3 and CONH3H2O ices: modification in the CONH3 ice structure

Abstract:

CO–NH3 and CO–NH3–H2O ices at 25–130 K were bombarded by 252Cf fission fragments (∼ 65 MeV at the target surface) and the emitted secondary ions were analyzed by time-of-flight mass spectrometry (TOFSIMS). It is observed that the mass spectra obtained from both ices have similar patterns. The production of hybrid ions (formed from CO and NH3 molecules) emitted from CO–NH3 ice has already been reported by R. Martinez et al., Int. J. Mass. Spectrom. 262 (2006) 195; here, the secondary ion emission and the modifications of the CO–NH3 ice structure during the temperature increase of the ice are addressed. These studies are expected to throw light on the sputtering from planetary and interstellar ices and the possible formation of new organic molecules in CO–NH3–H2O ice by megaelectronvolt ion bombardment. The presence of water in the CO–NH3 ice mixture generates molecular ion series …

Año de publicación:

2007

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