The critical dose required to break the Zn-N bonds in a ZnN4 tetrahedra is almost the same for all the Bragg planes, about 3.2 e -Å -2 , which means the breaking of Zn-N bonds occurs simultaneously throughout the crystal under the influence of an electron beam. Bragg planes of high index planes such as {431} and {400} fade and shrink in the beginning due to a smaller number of ZnN4 tetrahedra, whereas low index Bragg planes such as {110}, {211}, {200} and {222} with a higher number of ZnN4 tetrahedra fade slower. This degradation behavior of the crystal justifies the radiolysis damage mechanism . The resolution achievable in HRTEM imaging of the ZIF-8 depends upon the total dose used in the experiment. Therefore, the critical dose has a significant effect on the attainable resolution. If the cumulative dose is below 7 e -Å -2 , high-frequency planes can be resolved with an achievable real space resolution of 2.1 Å 8 . The high-resolution porous network distinguished by two Zn triplets with spatial resolution 3.3 Å represented by {431} Bragg plane can be resolved up to a cumulative dose of 11 e -Å -2 . The {211} Bragg plane with a spatial resolution of 6.5 Å could be resolved up to a cumulative dose of 24 e -Å -2 . The HRTEM image shown in the left inset in fig. (a) shows {211} Bragg spot with a spatial resolution of 6.5 Å with a cumulative dose around 19 eÅ -2 , which is much below the critical dose of the {211} Bragg plane. Hence, the critical dose estimated from fading the relative intensity of Bragg planes such as {110} and {211} from our diffraction studies matches well with the Bragg planes resolved in experimental HRTEM imaging.