Figure 2
Calculated 222 dark-field rocking curves for a 2000 Å-thick Cu crystal, for incident electron accelerating voltages of 250 kV (dashed curve) and 310 kV (solid curve). Note the minimum 222 intensity when the crystal is at the exact 222 Bragg position for an incident electron accelerating voltage of 310 kV, the critical voltage. Reproduced from Lally et al. (1972BB10).  [article HTML]