Anyone have a simplified explained notes about schoenflies notation and hermann-mauguin notation and notation table

Sajan sarthak Best Answer

Schoenflies notation symmetry elements Symmetry elements are denoted by i for centers of inversion, C for proper rotation axes, and σ for mirror planes, and S for improper rotation axes (rotation-reflection axes). C and S are usually followed by a subscript n denoting the order of rotation possible. By convention, the axis of proper rotation of greatest order is defined as the principle axis. All other symmetry elements are described in relation to it. Thus, mirror planes are denoted σv or σh for vertical mirror planes (parallel with the principal axis) and horizontal mirror planes (perpendicular with the principal axis). Point groups In three dimensions, there are 32 crystallographic point groups. *The letter "O" (for octahedron) indicates that the group has the symmetry of an octahedron (or cube), with ("Oh") or without ("O") improper operations (those that change handedness). *The letter "T" (for tetrahedron) indicates that the group has the symmetry of a tetrahedron. "Td" includes improper operations, "T" excludes improper operations, and "Th" is "T" with the addition of an inversion. *"Cn" (for cyclic) indicates that the group has an "n"-fold rotation axis. "Cnh" is "Cn" with the addition of a mirror (reflection) plane perpendicular to the axis of rotation. "Cnv" is "Cn" with the addition of a mirror plane parallel to the axis of rotation. *"Sn" (for "Spiegel", German for mirror) denotes a group that contains only an "n"-fold rotation-reflection axis. *"Dn" (for dihedral, or two-sided) indicates that the group has an "n"-fold rotation axis plus a twofold axis perpendicular to that axis. "Dnh" has, in addition, a mirror plane perpendicular to the "n"-fold axis. "Dnv" has, in addition to the elements of "Dn", mirror planes parallel to the "n"-fold axis. Due to the crystallographic restriction theorem, "n" is restricted to the values of 1, 2, 3, 4, or 6. HERMAN MAGUINE along with schenoflies DENOTE in.below table.