Table 1: SRIM input parameters for graphite and a-C:H.
Material $\rho \rm (g~cm^{-3})$ $X_{\rm H}$ $U_{\rm0}\rm (eV)$ $E_{\rm D} (\rm eV)$ $E_{\rm L} (\rm eV)$

``old graphite'' - 0 3 11 2

graphite 2.26 0 7.4 28 3

a-C:H₍₁₎ 1.5 0.2 4 10 3

a-C:H₍₂₎ 1.4 0.4 4 10 3

a-C:H₍₃₎ 1.3 0.55 4 10 3

Notes. $\rho$ is the bulk material density (taken from Smith 1984 for a-C:H), $X_{\rm H}$ the hydrogen atomic fraction, U₀ is the surface atom binding energy, $E_{\rm D}$ bulk atom displacement energy and $E_{\rm L}$ the lattice energy. The values used by Jurac et al. (1998) are here designated as ``old graphite''.

**Table 1:** SRIM input parameters for graphite and a-C:H.
Material	$\rho \rm (g~cm^{-3})$	$X_{\rm H}$	$U_{\rm0}\rm (eV)$	$E_{\rm D} (\rm eV)$	$E_{\rm L} (\rm eV)$
``old graphite''	-	0	3	11	2
graphite	2.26	0	7.4	28	3
a-C:H₍₁₎	1.5	0.2	4	10	3
a-C:H₍₂₎	1.4	0.4	4	10	3
a-C:H₍₃₎	1.3	0.55	4	10	3

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