\begin{table}%t18 %%\centering \par \caption{\label{Solid phase reactions used for complex molecule formation}Solid phase reactions used for complex molecule formation.} \begin{tabular}{llllll} \hline\hline\noalign{\smallskip} & Reactant1 & Reactant2 & Product1 & Product2 & Activation \\ & & & & & Energy $E_a$ (K) \\ \hline 1 & $*$C & $*$CO & $*$CCO & & $5.0 \times 10^2$ \\ 2 & $*$C & $*$CO & $*$COC & & $5.0 \times 10^2$ \\ 3 & $*$C & $*$H & $*$CH & & 0.0 \\ 4 & $*$C & $*$N & $*$CN & & 0.0 \\ 5 & $*$C & $*$NH & $*$HNC & & 0.0 \\ 6 & $*$C & $*$NH$_2$ & $*$H & $*$HNC & 0.0 \\ 7 & $*$C & $*$O & $*$CO & & 0.0 \\ 8 & $*$C & $*$O$_2$ & $*$CO & $*$O & 0.0 \\ 9 & $*$C & $*$OH & $*$CO & $*$H & 0.0 \\ 10 & $*$C & $*$OH & $*$COH & & 0.0 \\ 11 & $*$C$_2$H$_3$O & $*$H & $*$CH$_3$CHO & & 0.0 \\ 12 & $*$C$_2$H$_5$O & $*$H & $*$C$_2$H$_5$OH & & 0.0 \\ 13 & $*$C$_2$HO & $*$H & $*$CH$_2$CO & & 0.0 \\ 14 & $*$CCO & $*$H & $*$C$_2$HO & & 0.0 \\ 15 & $*$CH & $*$H & $*$CH$_2$ & & 0.0 \\ 16 & $*$CH & $*$O & $*$HCO & & 0.0 \\ 17 & $*$CH & $*$OH & $*$CHOH & & 0.0 \\ 18 & $*$CH$_2$ & $*$H & $*$CH$_3$ & & 0.0 \\ 19 & $*$CH$_2$ & $*$O & $*$H$_2$CO & & 0.0 \\ 20 & $*$CH$_2$ & $*$OH & $*$CH$_2$OH & & 0.0 \\ 21 & $*$CH$_2$CO & $*$H & $*$C$_2$H$_3$O & & 0.0 \\ 22 & $*$CH$_2$OC & $*$H & $*$CH$_3$OC & & 0.0 \\ 23 & $*$CH$_2$OH & $*$H & $*$CH$_3$OH & & 0.0 \\ 24 & $*$CH$_3$ & $*$H & $*$CH$_4$ & & 0.0 \\ 25 & $*$CH$_3$ & $*$O & $*$CH$_3$O & & 0.0 \\ 26 & $*$CH$_3$ & $*$OH & $*$CH$_3$OH & & 0.0 \\ 27 & $*$CH$_3$CHO & $*$H & $*$C$_2$H$_5$O & & 0.0 \\ 28 & $*$CH$_3$O & $*$H & $*$CH$_3$OH & & 0.0 \\ 29 & $*$CH$_3$OC & $*$H & $*$CH$_3$OCH & & 0.0 \\ 30 & $*$CH$_3$OCH & $*$H & $*$CH$_3$OCH$_2$ & & 0.0 \\ 31 & $*$CH$_3$OCH$_2$ & $*$H & $*$CH$_3$OCH$_3$ & & 0.0 \\ 32 & $*$CHOC & $*$H & $*$CH$_2$OC & & 0.0 \\ 33 & $*$CHOH & $*$H & $*$CH$_2$OH & & 0.0 \\ 34 & $*$CN & $*$H & $*$HCN & & 0.0 \\ 35 & $*$CO & $*$H & $*$COH & & $3.0 \times 10^3$ \\ 36 & $*$CO & $*$H & $*$HCO & & $1.0 \times 10^3$ \\ 37 & $*$CO & $*$OH & $*$CO$_2$ & $*$H & $3.0 \times 10^2$ \\ 38 & $*$COC & $*$H & $*$CHOC & & 0.0 \\ 39 & $*$COH & $*$H & $*$CHOH & & 0.0 \\ 40 & $*$H & $*$H & $*$H$_2$ & & 0.0 \\ 41 & $*$H & $*$H$_2$CO & $*$H$_2$ & $*$HCO & $1.85 \times 10^3$ \\ 42 & $*$H & $*$HCO & $*$CO & $*$H$_2$ & 0.0 \\ 43 & $*$H & $*$N & $*$NH & & 0.0 \\ 44 & $*$H & $*$NH & $*$NH$_2$ & & 0.0 \\ 45 & $*$H & $*$NH$_2$ & $*$NH$_3$ & & 0.0 \\ 46 & $*$H & $*$NO & $*$HNO & & 0.0 \\ 47 & $*$H & $*$O & $*$OH & & 0.0 \\ 48 & $*$H & $*$OH & $*$H$_2$O & & 0.0 \\ 49 & $*$HCO & $*$O & $*$CO & $*$OH & 0.0 \\ 50 & $*$HCO & $*$O & $*$CO$_2$ & $*$H & $2.0 \times 10^1$ \\ 51 & $*$N & $*$O & $*$NO & & 0.0 \\ 52 & $*$N & $*$OH & $*$HNO & & 0.0 \\ 53 & $*$NH & $*$O & $*$HNO & & 0.0 \\ 54 & $*$O & $*$O & $*$O$_2$ & & 0.0 \\ \hline \end{tabular} \vspace*{2mm} \end{table}