Accuracy

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23 Carbon, trimer

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###  |  |
# | Species | Formula
13 | Acetylene (Geo) | C2H2 |
14 | Vinyl, cation | C2H3 |
15 | Vinyl | C2H3 |
16 | Ethylene, cation | C2H4 |
17 | Ethylene (Geo) | C2H4 |
18 | Ethylene | C2H4 |
19 | Methylmethylene | C2H4 |
20 | Ethyl, cation | C2H5 |
21 | Ethyl radical | C2H5 |
22 | Ethane (Geo) | C2H6 |
23 | Carbon, trimer | C3 |
24 | Cyclopropenyl, cation | C3H3 |
25 | Propynyl, cation | C3H3 |
26 | Allene | C3H4 |
27 | Allene (Geo) | C3H4 |
28 | Cyclopropene (Geo) | C3H4 |
29 | Cyclopropene | C3H4 |
30 | Propyne | C3H4 |
31 | Propyne (Geo) | C3H4 |
32 | Allyl, cation | C3H5 |
33 | Cyclopropyl, cation | C3H5 |

ΔHf: 196.0 kcal/mol
I.P.: 11.1 eV, REF:

     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     1.28253356 +1    0.0000000 +0    0.0000000 +0     1     0     0
      C     1.28253356 +1  179.9997347 +1    0.0000000 +0     2     1     0