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 = 1.9 K & P = .01 GPa
      Note: structure known as the alpha form
      _database_code_amcsd 0015153

      CELL PARAMETERS:    4.0100   4.0100   4.0100   90.000   90.000   90.000
      SPACE GROUP: Im3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     64.481
      Density (g/cm3):      0.206
      MAX. ABS. INTENSITY / VOLUME**2:     0.6390414355    
      RIR:      1.009
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                31.55        100.00        2.8355    1   1   0        12
                45.23         13.80        2.0050    2   0   0         6
                56.19         21.72        1.6371    2   1   1        24
                65.88          5.12        1.4177    2   2   0        12
                74.88          5.48        1.2681    3   1   0        24
                83.51          1.09        1.1576    2   2   2         8
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.