Helium
      Henshaw D G
      Physical Review 109 (1958) 328-330
      Structure of solid helium by neutron diffraction
      Locality: synthetic
      Sample: at T = 1.1 K and P = .007 GPa
      _database_code_amcsd 0015152

      CELL PARAMETERS:    3.5300   3.5300   5.7600   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     62.159
      Density (g/cm3):      0.214
      MAX. ABS. INTENSITY / VOLUME**2:     0.4386506654    
      RIR:      0.668
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                29.21         24.89        3.0571    1   0   0         6
                31.05         27.48        2.8800    0   0   2         2
                33.18        100.00        2.7003    1   0   1        12
                43.15         13.02        2.0963    1   0   2        12
                51.80         12.25        1.7650    1   1   0         6
                56.61         12.34        1.6259    1   0   3        12
                60.58          1.50        1.5285    2   0   0         6
                61.63         11.06        1.5049    1   1   2        12
                62.91          7.52        1.4774    2   0   1        12
                64.74          1.46        1.4400    0   0   4         2
                69.64          1.53        1.3502    2   0   2        12
                72.57          1.25        1.3027    1   0   4        12
                80.28          2.31        1.1958    2   0   3        12
                85.76          1.14        1.1329    2   1   1        24
                87.41          2.10        1.1158    1   1   4        12
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       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.