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Result of symbol lookup:
Space group number: 89
Schoenflies symbol: D4^1
Hermann-Mauguin symbol: P 4 2 2
Hall symbol: P 4 2
Input space group symbol: P 4 2 2
Convention: Default
Number of lattice translations: 1
Space group is acentric.
Space group is chiral.
Number of representative symmetry operations: 8
Total number of symmetry operations: 8
Parallelepiped containing an asymmetric unit:
0<=x<=1/2; 0<=y<=1/2; 0<=z<=1/2
List of symmetry operations:
Matrix
| Rotation-part type
| Axis direction
| Screw/glide component
| Origin shift
|
x,y,z
| 1 | - | - | -
|
-y,x,z
| 4^1 | [0,0,1] | 0,0,0 | 0,0,0
|
-x,-y,z
| 2 | [0,0,1] | 0,0,0 | 0,0,0
|
y,-x,z
| 4^-1 | [0,0,1] | 0,0,0 | 0,0,0
|
x,-y,-z
| 2 | [1,0,0] | 0,0,0 | 0,0,0
|
y,x,-z
| 2 | [1,1,0] | 0,0,0 | 0,0,0
|
-x,y,-z
| 2 | [0,1,0] | 0,0,0 | 0,0,0
|
-y,-x,-z
| 2 | [-1,1,0] | 0,0,0 | 0,0,0
|
List of Wyckoff positions:
Wyckoff letter
| Multiplicity
| Site symmetry point group type
| Representative special position operator
|
p | 8 | 1 | x,y,z
|
o | 4 | 2 | x,1/2,0
|
n | 4 | 2 | x,0,1/2
|
m | 4 | 2 | x,1/2,1/2
|
l | 4 | 2 | x,0,0
|
k | 4 | 2 | x,x,1/2
|
j | 4 | 2 | x,x,0
|
i | 4 | 2 | 0,1/2,z
|
h | 2 | 4 | 1/2,1/2,z
|
g | 2 | 4 | 0,0,z
|
f | 2 | 222 | 1/2,0,1/2
|
e | 2 | 222 | 1/2,0,0
|
d | 1 | 422 | 1/2,1/2,1/2
|
c | 1 | 422 | 1/2,1/2,0
|
b | 1 | 422 | 0,0,1/2
|
a | 1 | 422 | 0,0,0
|
Harker planes:
Algebraic
| Normal vector
| A point in the plane
|
x-y,-x-y,0 | [0,0,1] | 0,0,0
|
0,2*y,2*z | [1,0,0] | 0,0,0
|
x+y,-x-y,2*z | [1,1,0] | 0,0,0
|
2*x,0,2*z | [0,1,0] | 0,0,0
|
x+y,x+y,2*z | [-1,1,0] | 0,0,0
|
Additional generators of Euclidean normalizer:
Number of structure-seminvariant vectors and moduli: 2
Vector Modulus
(0, 0, 1) 2
(1, 1, 0) 2
Inversion through a centre at: 0,0,0
Grid factors implied by symmetries:
Space group: (1, 1, 1)
Structure-seminvariant vectors and moduli: (2, 2, 2)
Euclidean normalizer: (2, 2, 2)
All points of a grid over the unit cell are mapped
exactly onto other grid points only if the factors
shown above are factors of the grid.
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