“…Many workers have studied photochemical escape of oxygen from present Mars Cipriani et al, 2007;Fox, 1993;Fox andHać , 2009, 2014;Gröller et al, 2014;Hodges, 2000;Kim et al, 1998;Krestyanikova and Shematovich, 2006;Lammer and Bauer, 1991;Shematovich, 2013;Valeille et al, 2010;Yagi et al, 2012;Zhang et al, 1993). Fox and Hać (2009) considered isotropic and forward scattering in the center-of-mass frame in a 3D Monte Carlo Model.…”