Table 1.

Electron diffraction planar spacings

3C Diamond			Graphene/graphane—oxide
Indices	Calculated, Å		Indices	Calculated graphene, Å	Presolar graphene, Å*	Younger–Dryas graphene, Å*,†	Younger–Dryas graphane, Å*,†,‡	Calculated graphane, Å
111	2.053		100	2.130	2.033 (6)	2.076 (4)	2.004 (7)	2.021
220	1.257		110	1.230	1.230 (2)	1.222 (2)	1.158 (2)	1.167
311	1.072		200	1.065	1.069 (3)	1.061 (2)	0.991 (3)	1.010
400	0.889
331	0.816		120	0.805	0.807 (2)	0.798 (1)	0.754 (2)	0.764
422	0.726		300	0.710	0.709 (2)	0.705 (1)	0.657 (1)	0.674
511/333	0.684
440	0.629		220	0.615	0.616 (1)	0.609 (1)	0.575 (2)	0.583
531	0.601		130	0.591	0.593 (1)	0.584 (1)	0.547 (5)	0.561
620	0.562
533	0.542		400	0.533	0.534 (1)	0.525 (1)	0.496 (2)	0.506
444	0.513
551/711	0.498		230	0.489	0.489 (1)	0.479 (1)	0.460 (1)	0.464
642	0.475
553/731	0.463		140	0.465	0.465 (1)	0.455 (1)	0.436 (6)	0.441
800	0.445
733	0.434		500	0.426	0.427 (1)	0.418 (1)	0.400 (1)	0.404
660/822	0.419		330	0.410	0.410 (1)	0.397 (1)	0.381 (1)	0.389

^*Detonation synthesized nanodiamonds were used to calibrate diffraction camera length of microscope. Values in parentheses are the measurement error (in the least significant digit) based on standard error of replicate measurements and the error in camera length calibration (± 0.2%).

^†Hexagonal edge length varies slightly from grain to grain.

^‡Measured from graphene/graphane aggregates.