Table 2: Comparison of the physical parameters for graphite and a-C:H.
Fragmentation Vaporization

Parameter Graphite a-C:H Graphite a-C:H

$\rho_{0}$ [g cm^-3] 2.2 1.4 2.2 1.4

c₀ [km s^-1] 1.8 1.0 1.8 1.0

s 1.9 1.9 1.9 1.9

$P_{\rm th}$ [dyne $\rm cm^{-2}$ ] $0.4 \times 10^{11}$ $0.2 \times 10^{11}$ $5.8 \times 10^{12}$ $2.8 \times 10^{12}$

$\varepsilon_{\rm v}$ [erg $\rm g^{-1}$ ] $1.8 \times 10^{9}$ $0.75 \times 10^{9}$ $6.4 \times 10^{11}$ $5.2 \times 10^{11}$

$v_{\rm th}$ [km $\rm s^{-1}$ ] 1.2 0.8 23 20

$E_{\rm b}$ [eV] 0.02 0.01 8 6.5

Note. Physical parameters for fragmentation and vaporization for a-C:H (this work) and for graphite/amorphous carbon (Tielens et al. 1994). c₀ is the sound speed, s is a dimensionless parameter, $P_{\rm th}$ , $\varepsilon_v$ and $v_{\rm th}$ are the relevant threshold pressure, energy density and velocity, respectively. $E_{\rm b}$ is the binding energy.

**Table 2:** Comparison of the physical parameters for graphite and a-C:H.
	Fragmentation	Vaporization
Parameter	Graphite	a-C:H	Graphite	a-C:H
$\rho_{0}$ [g cm^-3]	2.2	1.4	2.2	1.4
c₀ [km s^-1]	1.8	1.0	1.8	1.0
s	1.9	1.9	1.9	1.9
$P_{\rm th}$ [dyne $\rm cm^{-2}$ ]	$0.4 \times 10^{11}$	$0.2 \times 10^{11}$	$5.8 \times 10^{12}$	$2.8 \times 10^{12}$
$\varepsilon_{\rm v}$ [erg $\rm g^{-1}$ ]	$1.8 \times 10^{9}$	$0.75 \times 10^{9}$	$6.4 \times 10^{11}$	$5.2 \times 10^{11}$
$v_{\rm th}$ [km $\rm s^{-1}$ ]	1.2	0.8	23	20
$E_{\rm b}$ [eV]	0.02	0.01	8	6.5

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