Helium
      Schuch A F, Grilly E R, Mills R L
      Physical Review 110 (1958) 775-775
      Structure of the alpha and beta forms of solid He
      Locality: synthetic
      Sample: at T = 3.3 K & P = .018 GPa
      Note: structure known as the beta form
      _database_code_amcsd 0015154

      CELL PARAMETERS:    3.4600   3.4600   5.6000   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     58.059
      Density (g/cm3):      0.229
      MAX. ABS. INTENSITY / VOLUME**2:     0.4668356120    
      RIR:      0.664
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                29.82         25.18        2.9964    1   0   0         6
                31.96         27.00        2.8000    0   0   2         2
                33.93        100.00        2.6420    1   0   1        12
                44.27         12.69        2.0458    1   0   2        12
                52.93         12.00        1.7300    1   1   0         6
                58.23         11.67        1.5844    1   0   3        12
                61.94          1.45        1.4982    2   0   0         6
                63.18         10.58        1.4717    1   1   2        12
                64.37          7.25        1.4473    2   0   1        12
                66.82          1.34        1.4000    0   0   4         2
                71.41          1.46        1.3210    2   0   2        12
                74.86          1.16        1.2684    1   0   4        12
                82.57          2.19        1.1684    2   0   3        12
                87.97          1.10        1.1101    2   1   1        24
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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.