Pna21 jpeg

International Tables tor Crystallography (2006). Vol. A, Spaca group 33, pp. 234-235.

Pna2l	a
No. 33	Pna 2,
	Pnat,
	—+—-H
I i	j S t i i
	’ ' T "1
	i—^1—i—L— i
__ Fl,cn n i t
£

mm 2    Orthorhombic

Patterson symmetry Pmmm

K)_f___T_ho

o*	Ob
♦o	_ho

o-    o*

Origin on 112,

Asymmetric unit 0<*<j; 0<y<|; 0<z<l Symmetry operations

(1)1    (2) 2(0,0,j) 0,0,z    (3)o *,J,z    (4) n(0,j,|) i,y,z

Copyright« 2006 International Union of CryslaHography

CONTINUED

No. 33    Pna2_{

Generatorsselected (1); f{],0,0); <(0,1,0); <(0,0,1); (2); (3) Positions

Reflection conditions General:

Multiplicity,    Coordinates

Wyckoff letter,

Site symmetry

4 a 1    (l)x,y,z    (2)x,y,z+)    (3)x +j,;y +(4)i+ j.y+ j,z+j Oki ; k+l = 2n

hOl : h = 2n hOO: h = 2n OkO: JŁ = 2n 001: 1 = 2 n

Symmetry of special projections

Along [001] p2gg		Along [100] clm 1	Along [010] p 1 Ig
a' = a b‘ = b		a' = b b' = c	a' = c b' = ja
Origin at 0,0, z		Origin at x,;, 0	Origin at0,y,0
Maximal non-isomorphic subgroups
I [2]Rlal(Rc,7)	1; 3
[2] Pnl 1 (Pc, 7)	1; 4
[2] PI 12, (P2t, 4)	1; 2
Ha nonę Ilb nonę

Maximal isomorphic subgroups of lowest index

Uc (3) Pna2, (a' = 3a) (33); [3] Pnal, (b’ = 3b) (33); [3]Pna2_J (c' = 3c) (33)

Minimal non-isomorphic supergroups

I [2] Pnna (52); [2]Pccn(56Y, [2] Pbcn (60); [2] Roma (62)

n    (2) Cc m 2, (Cmc2,,36); [2}Ama2 (40); [2] B6e2 (/i ea 2,41); (2J Im a 2 (46); [2] P ca 2, (b = jb) (29);

[2] Pnm 2, (a’ = (a) (Pmn 2„ 31); [2] Pba 2 (C = j c) (32)

235