Plasma desorption mass spectrometry analysis of HCOOH ice

Abstract:

Planetary magnetospheres, in which outer planet satellites orbit, are bombarded by energetic particles inducing chemical and physical changes in their icy surfaces. The existing condensed gases react to form new products, which then undergo thermal evolution from the natural day/night cycles of these satellites. Plasma irradiation of ice causes phase changes, e.g., water ice from crystalline to amorphous over short timescales. When ice is recrystallized by heating, the surface layers retain some disorder, which promote reactions among adsorbed molecules such as H2O, CO2, CH2CO, HCOOH and theirs radiolysis products. In this work, chemical reactions involving formic acid condensed at 56K are analyzed by using Plasma Desorption Mass Spectrometry-time-of-flight (252Cf-PDMS-TOF). Mass spectra of positive and negative desorbed ions were obtained, giving information on the structure and abundance of …

Año de publicación:

2007

Keywords:

Fuente:

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