Hydrogen
      Mao H K, Jephcoat A P, Hemley R J, Finger L W, Zha C S, Hazen R M, Cox D E
      Science 239 (1988) 1131-1133
      Synchrotron X-ray diffraction measurements of single-crystal hydrogen to
      26.5 Gigapascals
      Locality: synthetic
      Sample: at P = 10.1 GPa, T = 300 K
      _database_code_amcsd 0015433

      CELL PARAMETERS:    2.5058   2.5058   4.0740   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     22.154
      Density (g/cm3):      0.151
      MAX. ABS. INTENSITY / VOLUME**2:     0.6658644382E-01
      RIR:      0.144
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                41.62         34.42        2.1701    1   0   0         6
                44.48         32.08        2.0370    0   0   2         2
                47.47        100.00        1.9153    1   0   1        12
                62.54          5.98        1.4852    1   0   2        12
                75.95          1.09        1.2529    1   1   0         6
                84.08          2.53        1.1512    1   0   3        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.