![symmetry group diagram](/Ea/ch3o1v0001/gifs/r40.gif)
Origin at centre (4/m) at 4/mcc
Asymmetric unit | 0 ≤ x; 0 ≤ y; 0 ≤ z ≤ 1/4 |
(1) 1 | (2) 2 0, 0, z | (3) 4+ 0, 0, z | (4) 4- 0, 0, z |
(5) 2 0, y, 1/4 | (6) 2 x, 0, 1/4 | (7) 2 x, x, 1/4 | (8) 2 x, -x, 1/4 |
(9) -1 0, 0, 0 | (10) m x, y, 0 | (11) -4+ 0, 0, z; 0, 0, 0 | (12) -4- 0, 0, z; 0, 0, 0 |
(13) c x, 0, z | (14) c 0, y, z | (15) c x, -x, z | (16) c x, x, z |
Generators selected (1); t(0, 0, 1); (2); (3); (5); (9)
Multiplicity, Wyckoff letter, Site symmetry | Coordinates | Reflection conditions |
|
| | General:
|
| (1) x, y, z | (2) -x, -y, z | (3) -y, x, z | (4) y, -x, z | (5) -x, y, -z + 1/2 | (6) x, -y, -z + 1/2 | (7) y, x, -z + 1/2 | (8) -y, -x, -z + 1/2 | (9) -x, -y, -z | (10) x, y, -z | (11) y, -x, -z | (12) -y, x, -z | (13) x, -y, z + 1/2 | (14) -x, y, z + 1/2 | (15) -y, -x, z + 1/2 | (16) y, x, z + 1/2 |
| l: l = 2n
|
| | Special: no extra conditions |
| x, y, 0 | -x, -y, 0 | -y, x, 0 | y, -x, 0 | -x, y, 1/2 | x, -y, 1/2 | y, x, 1/2 | -y, -x, 1/2 |
| |
| x, 0, 1/4 | -x, 0, 1/4 | 0, x, 1/4 | 0, -x, 1/4 | -x, 0, 3/4 | x, 0, 3/4 | 0, -x, 3/4 | 0, x, 3/4 |
| |
| x, x, 1/4 | -x, -x, 1/4 | -x, x, 1/4 | x, -x, 1/4 | -x, -x, 3/4 | x, x, 3/4 | x, -x, 3/4 | -x, x, 3/4 |
| |
| 0, 0, z | 0, 0, -z + 1/2 | 0, 0, -z | 0, 0, z + 1/2 |
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Symmetry of special projections
Along [001] 4mm
Origin at 0, 0, z | Along [100] 2mm a' = 1/2c Origin at x, 0, 0 | Along [110] 2mm a' = 1/2c Origin at x, x, 0 |
Maximal non-isotypic non-enantiomorphic subgroups
I | [2] -42c (38) | 1; 2; 5; 6; 11; 12; 15; 16 |
| [2] -4c2 ( -42c, 38) | 1; 2; 7; 8; 11; 12; 13; 14 |
| [2] 4cc (36) | 1; 2; 3; 4; 13; 14; 15; 16 |
| [2] 422 (30) | 1; 2; 3; 4; 5; 6; 7; 8 |
| [2] 4/m11 ( 4/m, 28) | 1; 2; 3; 4; 9; 10; 11; 12 |
| [2] 2/m2/c1 ( ccm, 21) | 1; 2; 5; 6; 9; 10; 13; 14 |
| [2] 2/m12/c ( ccm, 21) | 1; 2; 7; 8; 9; 10; 15; 16 |
Maximal isotypic subgroups and enantiomorphic subgroups of lowest index
IIc | [3] 4/mcc (c' = 3c) (40) |
Minimal non-isotypic non-enantiomorphic supergroups
II | [2] 4/mmm (c' = 1/2c) (39) |