Accuracy

h2r      2 Hydrogen (Geo)

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    #  Species Formula
  1941 1,3-DiiodopropaneC3H6I2
  1942 1,2-DiiodobutaneC4H8I2
  1943 1,4-DiiodobutaneC4H8I2
  1944 1,2-DiiodobenzeneC6H4I2
  1945 1,2-Diiodobenzene (Geo)C6H4I2
  1946 5,7-Diiodo-8-hydroxyquinolineC9H5NOI2
  1947 1,2 DiiodotetrafluoroethaneC2F4I2
  1948 Iodoform (Geo)HCI3
  1949 IodoformHCI3
     1 Hydrogen, atomH
     2 Hydrogen (Geo) H2
     3 HydrogenH2
     4 Carbon, atomC
     5 MethylidyneHC
     6 Methylene, singlet (Geo)CH2
     7 Methylene, triplet (Geo)CH2
     8 Methylene, singletCH2
     9 Methyl, cationCH3
    10 Methane (Geo)CH4
    11 MethaneCH4
    12 AcetyleneC2H2


REF: M. W. Chase, C. A. Davies, J. R. Downey, D. R. Frurip, R. A. McDonald, A. N. Syverud, JANAF Thermochemical Tables, Third Edition, J. Phys. Chem. Ref. Data 14, Suppl. 1 (1985).
  
 GEO-OK
Hydrogen
 GR=JANAF86 <H-H>
  H     0.00000000 +0    0.0000000 +0    0.0000000 +0     0     0     0
  H     0.74140000 +1    0.0000000 +0    0.0000000 +0     1     0     0