Open AccessRole of molecular species in pickup ion sputtering of the Martian atmosphere
Author(s) -
Leblanc F.,
Johnson R. E.
Publication year - 2002
Publication title -
journal of geophysical research: planets
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2000je001473
Subject(s) - sputtering , atmosphere (unit) , thermosphere , ion , martian , astrobiology , atmospheric escape , atomic physics , atmosphere of mars , mars exploration program , pickup , particle (ecology) , materials science , physics , ionosphere , thin film , nanotechnology , geophysics , meteorology , geology , oceanography , quantum mechanics , artificial intelligence , computer science , image (mathematics)
This paper presents a new approach for calculating the sputtering of an atmosphere by impacting particles when there are molecular species at the exobase. We couple a test particle Monte Carlo approach with a molecular dynamic model to describe the collisions between hot particles and cold molecules in the Martian atmosphere. It is shown that both the heating efficiency and sputtering by pickup ions are reduced from that in an atomic thermosphere. The yields are given for three different ratios of atoms to molecules at the exobase and are used to obtain a better estimate of the total loss of atmosphere due to the pickup ion sputtering. Using the pickup ion fluxes of Zhang et al. [1993], ∼120 mbar of O and ∼60 mbar of CO 2 are lost. The loss of O if associated with H 2 O would be equivalent to ∼4 m averaged over the Mars surface.