Urea
      Guth H, Heger G, Klein S, Treutmann W, Scheringer C
      Zeitschrift fur Kristallographie 153 (1980) 237-254
      Strukturverfeinerung von harnstoff mit neutronenbeugungsdaten bei
      60, 123, 293 K und X-N- und X-X (1s2)-synthesen bei etwa 100 K
      Sample: T = 123 K
      _database_code_amcsd 0010833

      CELL PARAMETERS:    5.5780   5.5780   4.6950   90.000   90.000   90.000
      SPACE GROUP: P-42_1m   
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    146.081
      Density (g/cm3):      1.365
      MAX. ABS. INTENSITY / VOLUME**2:      9.544236851    
      RIR:      2.276
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                22.54        100.00        3.9442    1   1   0         4
                24.79         21.82        3.5920    1   0   1         8
                29.58         27.45        3.0200    1   1   1         4
                32.09          6.61        2.7890    2   0   0         4
                36.00         13.90        2.4946    2   1   0         8
                37.51         11.43        2.3978    2   0   1         8
                38.34          1.54        2.3475    0   0   2         2
                40.97          4.27        2.2029    2   1   1         8
                41.75          5.71        2.1637    1   0   2         8
                44.94          1.75        2.0172    1   1   2         4
                46.02          5.27        1.9721    2   2   0         4
                50.17          5.92        1.8182    2   2   1         4
                52.97          2.50        1.7287    3   0   1         8
                53.61          1.48        1.7096    2   1   2         8
                55.66          6.61        1.6512    3   1   1         8
                61.54          1.35        1.5068    1   0   3         8
                70.44          1.39        1.3368    4   0   1         8
                71.11          1.71        1.3257    2   1   3         8
                71.80          1.75        1.3147    3   3   0         4
                76.35          1.16        1.2473    4   2   0         8
                82.38          1.29        1.1707    3   1   3         8
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.