Accuracy

carbon, trimer     23 Carbon, trimer

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    #  Species Formula
    13 Acetylene (Geo)C2H2
    14 Vinyl, cationC2H3
    15 VinylC2H3
    16 Ethylene, cationC2H4
    17 Ethylene (Geo)C2H4
    18 EthyleneC2H4
    19 MethylmethyleneC2H4
    20 Ethyl, cationC2H5
    21 Ethyl radicalC2H5
    22 Ethane (Geo)C2H6
    23 Carbon, trimer C3
    24 Cyclopropenyl, cationC3H3
    25 Propynyl, cationC3H3
    26 AlleneC3H4
    27 Allene (Geo)C3H4
    28 Cyclopropene (Geo)C3H4
    29 CyclopropeneC3H4
    30 PropyneC3H4
    31 Propyne (Geo)C3H4
    32 Allyl, cationC3H5
    33 Cyclopropyl, cationC3H5


ΔHf: 196.0 kcal/mol,     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).
I.P.: 11.1 eV,     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.
  
 UHF
Carbon, trimer
 H=196 HR=JANAF86 I=11.1 IR=LLNBS82
  C     0.00000000 +0    0.0000000 +0    0.0000000 +0     0     0     0
  C     1.28580518 +1    0.0000000 +0    0.0000000 +0     1     0     0
  C     1.28580515 +1  179.9997077 +1    0.0000000 +0     2     1     0