In step III, the displacement of {222} Bragg plane is still in progress, which signifies the change in the interplanar spacing of ABC stacking along the body diagonal of the ZIF-8 unit cell. Each stacking contains 4 ZnN4 tetrahedra per unit cell compared to 3 ZnN4 tetrahedra in {431} Bragg planes. Therefore, a higher cumulative dose is required to break all these N-Zn bonds. As the cumulative dose exceeds 35 e -Å -2 , the {222} Bragg plane has completely collapsed. The total displacement of {222} Bragg planes before it completely collapsed was 0.2 Å, as shown in fig. ), and the rate of change in relative displacement per unit dose was 0.033 (1/e -Å -2 ) as measured from fig. ), presented in table .