Accuracy

methylidyne      5 Methylidyne

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    #  Species Formula
  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 Methylidyne HC
     6 Methylene, singlet (Geo)CH2
     7 Methylene, triplet (Geo)CH2
     8 Methylene, singletCH2
     9 Methyl, cationCH3
    10 Methane (Geo)CH4
    11 MethaneCH4
    12 AcetyleneC2H2
    13 Acetylene (Geo)C2H2
    14 Vinyl, cationC2H3
    15 VinylC2H3


ΔHf: 142.4 kcal/mol,     REF: R. D. Levin, S. G. Lias, "Ionization Potentials and Appearance Potential Measurements," 1971-1981, Natl. Stand. Ref. Data Ser., Natl. Bur. Stand. 71, (1982), Cat. No. C13.48:71.
  
 OPEN(1,1)
Methylidyne
 H=142.4 HR=LLNBS82
 XX     1.00000000 +0    0.0000000 +0    0.0000000 +0     0     0     0
  C     1.00000000 +0    0.0000000 +0    0.0000000 +0     1     0     0
  H     1.07438045 +1   90.0000000 +0    0.0000000 +0     2     1     0