p2/m11 2/m Monoclinic/Rectangular
No. 14 p2/m11 Patterson symmetry p2/m11

symmetry group diagram

Origin at centre (2/m)

Asymmetric unit 0 ≤ x ≤ 1/2; 0 ≤ y ≤ 1/2

Symmetry operations

(1)  1
      (1 | 0, 0, 0)
(2)  2   x, 0, 0
      (2x | 0, 0, 0)
(3)  -1   0, 0, 0
      (-1 | 0, 0, 0)
(4)  m   0, yz
      (mx | 0, 0, 0)

Generators selected (1); t(1, 0, 0); t(0, 1, 0); (2); (3)

Positions

Multiplicity, Wyckoff letter,
Site symmetry
Coordinates Reflection conditions

  General:
4 i 1
(1) xyz (2) x-y-z (3) -x-y-z (4) -xyz
no conditions
    Special: no extra conditions
2 h  m 
1/2yz 1/2-y-z
2 g  m 
0, yz 0, -y-z
2 f  2 
x1/2, 0 -x1/2, 0
2 e  2 
x, 0, 0 -x, 0, 0
1 d  2/m 
1/21/2, 0
1 c  2/m 
0, 1/2, 0
1 b  2/m 
1/2, 0, 0
1 a  2/m 
0, 0, 0

Symmetry of special projections

Along [001]   p2mm
a' = a   b' = bp   
Origin at 0, 0, z
Along [100]   [script p]211
a' = b   
Origin at x, 0, 0
Along [010]   [script p]2mm
a' = a   
Origin at 0, y, 0

Maximal non-isotypic subgroups


I [2] pm11 (11) 1; 4
  [2] p211 (8) 1; 2
  [2] p-1 (2) 1; 3
IIa none
IIb [2] c2/m11 (a' = 2ab' = 2b) (18); [2] p2/b11 (b' = 2b) (16); [2] p21/m11 (a' = 2a) (15)

Maximal isotypic subgroups of lowest index


IIc [2] p2/m11 (a' = 2a) (14); [2] p2/m11 (b' = 2b) (14)

Minimal non-isotypic supergroups


I [2] pmmm (37); [2] pmaa (38); [2] pmma (41); [2] pman (42)
II [2] c2/m11 (18)








































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