“…The Rackett method is used to give an approximate molar volume for the solids for which we do not have experimental data. (Brew , 1977;Kuebler and McKinley, 1975), C 2 H 2 (Neumann and Mann, 1969), C 4 H 6 (Preston et al, 1971), C 6 H 6 (von Szalghary, 1972Luks et al, 1981;Kuebler and McKinley, 1995;Malaska and Hodyss, 2014) and CO 2 (Clark and Din, 1953;Davis et al, 1962;Cheung and Zander , 1968;Preston et al, 1971) Table 1: Production rates (in molecules/cm 2 /s) of simple solid organics in Titan's atmosphere derived from several photochemical models. Not reported here is the production rate of tholins, estimated by Cabane et al (1992), Rannou et al (2003) and Krasnopolsky (2009) to be between 0.2 and 7 kg/cm 2 /GEyr (Giga Earth year).…”