data_global
_amcsd_formula_title 'Cl H4 N O4'
loop_
_publ_author_name
'Smith H'
'Levy H'
_journal_name_full 'Acta Crystallographica'
_journal_volume 15 
_journal_year 1962
_journal_page_first 1201
_journal_page_last 1206
_publ_section_title
;
 Neutron Diffraction Study of Ammonium Perchlorate
 _cod_database_code 1008111
;
_database_code_amcsd 0016053
_chemical_formula_sum 'N Cl O4'
_cell_length_a 9.2
_cell_length_b 5.82
_cell_length_c 7.45
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 398.903
_exptl_crystal_density_diffrn      1.889
_symmetry_space_group_name_H-M 'P n m a'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2-y,z'
  '-x,1/2+y,-z'
  '1/2-x,1/2+y,1/2+z'
  '1/2+x,1/2-y,1/2-z'
  '1/2+x,y,1/2-z'
  '1/2-x,-y,1/2+z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
N1   0.18200   0.75000   0.16600
Cl1   0.43200   0.25000   0.19300
O1   0.31400   0.25000   0.06100
O2   0.57000   0.25000   0.10700
O3   0.41800   0.05300   0.30300