Notes. ^(a)The density of solid CH₄ was taken from the work of Luna et al. (2012), those of C₂H₄ and C₂H₆ were taken from the work of Satorre et al. (2017), and that of C₃H₈ was taken from the work of Hudson et al. (2021). The densities of solid C₆H₁₄ and C₈H₁₈ were approximated as 1 g cm^-3. For mixed ices, densities were estimated as being the average value of the mixture components, in which the densities of N₂ and NH₃ were, respectively, taken to be 0.94 and 0.72 g cm^-3 (Satorre et al. 2008, 2013); ^(b)PD and SP refer, respectively, to the penetration depth and stopping power of a 1 keV electron impacting the target ice orthogonally to its surface, as output by the CASINO model. A total exposure dose of 1 keV electrons is expressed in the units eV/16u, where u is the unified atomic mass unit defined as 1/12 of the mass of an isolated atom of ¹²C; ^(c) irradiation products were identified on the basis of their VUV spectroscopic features and changes observed during post-irradiative warming.