Table 1: Molecular properties of the (hydro)carbon species taking part in the grain growth process. From the left the columns give: the i,m used in the growth rates; the molecule species; the atomic weight; the (constant) sticking coefficient (Eq. (13); these are the same numbers used for $\alpha _i$ and $\alpha ^{{\rm c}}_{i,m}$ in Eqs. (4-7)); the binding energy for each species to a sp³ carbon surface; and the corresponding source of binding energies in the literature.
i,m mol. A $\alpha_{{\rm C}}$ $E_{{\rm b}}$ references for $E_{{\rm b}}$

$[m_{{\rm u}}]$ $[\mbox{eV}]$

1 C 12.011 0.37 4.0 priv. comm. $\;\dots$

2 $\ensuremath{\mbox{C}_2}$ 24.022 0.34 5.0 $\dots\;$ K. Larsson (2003)

2,1 $\ensuremath{\mbox{C}_2\mbox{H}}$ 25.030 0.34 6.5 Larsson et al. (1993)

2,2 $\ensuremath{\mbox{C}_2\mbox{H}_2}$ 26.038 0.34 0.27 Larsson et al. (1993)

**Table 1:** Molecular properties of the (hydro)carbon species taking part in the grain growth process. From the left the columns give: the i,m used in the growth rates; the molecule species; the atomic weight; the (constant) sticking coefficient (Eq. (13); these are the same numbers used for $\alpha _i$ and $\alpha ^{{\rm c}}_{i,m}$ in Eqs. (4-7)); the binding energy for each species to a sp³ carbon surface; and the corresponding source of binding energies in the literature.
i,m	mol.	A	$\alpha_{{\rm C}}$	$E_{{\rm b}}$	references for $E_{{\rm b}}$
		$[m_{{\rm u}}]$		$[\mbox{eV}]$
1	C	12.011	0.37	4.0	priv. comm. $\;\dots$
2	$\ensuremath{\mbox{C}_2}$	24.022	0.34	5.0	$\dots\;$ K. Larsson (2003)
2,1	$\ensuremath{\mbox{C}_2\mbox{H}}$	25.030	0.34	6.5	Larsson et al. (1993)
2,2	$\ensuremath{\mbox{C}_2\mbox{H}_2}$	26.038	0.34	0.27	Larsson et al. (1993)

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