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 = 5.40 GPa, T = 300 K
      _database_code_amcsd 0015432

      CELL PARAMETERS:    2.6590   2.6590   4.3340   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     26.537
      Density (g/cm3):      0.126
      MAX. ABS. INTENSITY / VOLUME**2:     0.6633732008E-01
      RIR:      0.171
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                39.12         33.11        2.3028    1   0   0         6
                41.68         31.85        2.1670    0   0   2         2
                44.56        100.00        2.0335    1   0   1        12
                58.48          6.49        1.5781    1   0   2        12
                70.88          3.62        1.3295    1   1   0         6
                78.09          2.84        1.2238    1   0   3        12
                85.73          2.09        1.1332    1   1   2        12
                87.70          1.37        1.1128    2   0   1        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.