Table 1 Lattice spacings d and corresponding hkl indices attributed and those based on the diffraction patterns given in refs. ^5,10 and in the present work to the fcc-carbon

hkl	d_exp (Å) from ref. ¹⁰	d_calc (Å) adopted from ref. ¹⁰ at a₀= 3.563 Å	d (Å) from ref. ⁵	d (Å) from the present work
111	2.067	2.057	2.06	2.058^a/2.076 ± 0.005^b/2.05017^c
200^d	1.791	1.781	1.78	1.786^a/1.787 ± 0.0015^b/1.77550^c
220	1.261	1.260	1.26	1.266^a/1.257 ± 0.0008^b/1.25546^c
311	1.078	1.074	1.07	1.074^a
222^d	1.032	1.029	1.04	1.030^a/1.0298 ± 0.005^b/1.02508^c
400	0.892	0.891	0.896	0.893^a/0.891 ± 0.0015^b/0.88775^c
331	0.817	0.817	0.818	0.812^a/−/1.07066^c
420^d	0.796	0.797	0.796	0.783^a
422	0.727	0.727	0.726	0.720^a
331/511	0.686	0.686	0.683	0.680^a
440	0.630	0.630	-	0.630^a
531	0.601	0.602	-	0.550^a

^aBased on the electron diffraction pattern shown in Fig. 1a.
^bBased on the XRD results (Fig. 1b–d).
^cBased on the ab initio calculations (simulated from the charge density of fcc-carbon).
^dReflexes forbidden for the diamond crystal lattice.

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