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hOl •• >' OOi •■ ¹

2i» = 2n

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2

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CONTINUED

No. 7

Pc

Pini

UNIQUE AXIS b, CELL CHOICE 2

Origin on glide piane n

Asymmetric unit 0 < x < 1; 0 < y < £; 0 < z < 1 Generators selected (1); *(1,0,0); *(0,1,0); /(0,0,1); (2)

Positions

Multiplicity,    Coordinates    Reflection conditions

Wyckoff letter,

Site symmetry    General:

2 a 1    (l)x,y,z (2) x+ j,y,z+ j    hOl : h + l = 2n

hOO: h = 2n 00/ : / = 2n

Reflection conditions

General:

hOl : h~2n hOO : h = 2n

Plal

UNIQUE AXIS b, CELL CHOICE 3 Origin on glide piane a

Asymmetric unit 0<x<l; 0<y<j; 0<z<l Generators selected (1); /(1,0,0); /(0,1,0); *(0,0,1); (2) Positions

Multiplicity,    Coordinates

Wyckoff letter,

Site symmetry

2 a 1    (l)x,y,z    (2)x+{,y,z

139