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.. common
H2
H
CO
OH
HCO+
C
H3+
C+
H2O
e-

.. in RATE12
C
C+
C-
C10
C10+
C10-
C10H
C10H+
C10H-
C10H2
C10H2+
C10H3+
C11
C11+
C2
C2+
C2-
C2H
C2H+
C2H-
C2H2
C2H2+
C2H3
C2H3+
C2H4
C2H4+
C2H5
C2H5+
C2H5CN
C2H5CNH+
C2H5OH
C2H5OH+
C2H5OH2+
C2H7+
C2N
C2N+
C2N2+
C2NH+
C2O
C2O+
C2S
C2S+
C3
C3+
C3-
C3H
C3H+
C3H-
C3H2
C3H2+
C3H2O+
C3H3+
C3H4+
C3H5+
C3H6+
C3H7+
C3N
C3N+
C3N-
C3O
C3O+
C3P
C3S
C3S+
C4
C4+
C4-
C4H
C4H+
C4H-
C4H2+
C4H3
C4H3+
C4H4+
C4H5+
C4H7+
C4N
C4N+
C4P
C4P+
C4S
C4S+
C5
C5+
C5-
C5H
C5H+
C5H-
C5H2
C5H2+
C5H3+
C5H5+
C5N
C5N+
C5N-
C6
C6+
C6-
C6H
C6H+
C6H-
C6H2
C6H2+
C6H3+
C6H4+
C6H5+
C6H6
C6H6+
C6H7+
C7
C7+
C7-
C7H
C7H+
C7H-
C7H2
C7H2+
C7H3+
C7H4+
C7H5+
C7N
C7N+
C8
C8+
C8-
C8H
C8H+
C8H-
C8H2
C8H2+
C8H3+
C8H4+
C8H5+
C9
C9+
C9-
C9H
C9H+
C9H-
C9H2
C9H2+
C9H3+
C9H4+
C9H5+
C9N
C9N+
CCP
CCP+
CCl
CCl+
CF+
CH
CH+
CH-
CH2
CH2+
CH2CCH
CH2CCH+
CH2CCH2
CH2CHCCH
CH2CHCHCH2
CH2CHCN
CH2CHCN+
CH2CHCNH+
CH2CN
CH2CN+
CH2CO
CH2CO+
CH2NH
CH2NH2+
CH2PH
CH3
CH3+
CH3C3N
CH3C3N+
CH3C3NH+
CH3C4H
CH3C4H+
CH3C5N
CH3C5NH+
CH3C6H
CH3C7N
CH3C7NH+
CH3CCH
CH3CH3
CH3CH3+
CH3CHCH2
CH3CHO
CH3CHO+
CH3CHOH+
CH3CN
CH3CN+
CH3CNH+
CH3CO+
CH3COCH3
CH3COCH3+
CH3COCH4+
CH3CS+
CH3OCH3
CH3OCH3+
CH3OCH4+
CH3OH
CH3OH+
CH3OH2+
CH4
CH4+
CH4N+
CH5+
CN
CN+
CN-
CNC+
CNO
CO
CO+
CO2
CO2+
COOCH4+
CP
CP+
CRP
CRPHOT
CS
CS+
Cl
Cl+
ClO
ClO+
F
F+
Fe
Fe+
H
H+
H-
H2
H2+
H2C4N+
H2C7N+
H2C9N+
H2CCC
H2CCl+
H2CN
H2CNO+
H2CO
H2CO+
H2CS
H2CS+
H2Cl+
H2F+
H2NC+
H2NCO+
H2NO+
H2O
H2O+
H2O2
H2OCN+
H2PO+
H2S
H2S+
H2S2
H2S2+
H2SiO
H2SiO+
H3+
H3C3O+
H3C5N+
H3C7N+
H3C9N+
H3CO+
H3CS+
H3O+
H3S+
H3S2+
H3SiO+
H5C2O2+
HC2O+
HC2P
HC2P+
HC2S+
HC3N
HC3N+
HC3NH+
HC3O+
HC3S+
HC4H
HC4N+
HC4S+
HC5N
HC5N+
HC5NH+
HC7N
HC7N+
HC9N
HC9N+
HCN
HCN+
HCNH+
HCNO
HCNO+
HCNOH+
HCO
HCO+
HCO2+
HCOOCH3
HCOOH
HCOOH+
HCOOH2+
HCP
HCP+
HCS
HCS+
HCSi
HCSi+
HCl
HCl+
HF
HF+
HN2O+
HNC
HNC3
HNCO
HNCO+
HNCOH+
HNO
HNO+
HNS+
HNSi
HNSi+
HOC+
HOCN
HOCN+
HOCS+
HONC
HONC+
HPN+
HPO
HPO+
HS
HS+
HS2
HS2+
HSO+
HSO2+
HSiO2+
HSiS+
He
He+
HeH+
Mg
Mg+
N
N+
N2
N2+
N2H+
N2O
N2O+
NCCN
NCCNCH3+
NCCNH+
NH
NH+
NH2
NH2+
NH2CN
NH2CNH+
NH3
NH3+
NH4+
NO
NO+
NO2
NO2+
NS
NS+
Na
Na+
O
O+
O-
O2
O2+
O2-
O2H
O2H+
OCN
OCN+
OCS
OCS+
OH
OH+
OH-
P
P+
PC2H2+
PC2H3+
PC2H4+
PC3H+
PC4H+
PCH2+
PCH3+
PCH4+
PH
PH+
PH2
PH2+
PH3+
PHOTON
PN
PN+
PNH2+
PNH3+
PO
PO+
S
S+
S-
S2
S2+
SO
SO+
SO2
SO2+
Si
Si+
SiC
SiC+
SiC2
SiC2+
SiC2H
SiC2H+
SiC2H2
SiC2H2+
SiC2H3+
SiC3
SiC3+
SiC3H
SiC3H+
SiC3H2+
SiC4
SiC4+
SiC4H+
SiCH2
SiCH2+
SiCH3
SiCH3+
SiCH4+
SiF+
SiH
SiH+
SiH2
SiH2+
SiH3
SiH3+
SiH4
SiH4+
SiH5+
SiN
SiN+
SiNC
SiNC+
SiNCH+
SiNH2+
SiO
SiO+
SiO2
SiOH+
SiS
SiS+
e-

HC4H

HCCCCH, Diacetylene
Flags: Detected, RATE12
Empirical: C4H2
Mass: 50 amu
Dipole moment: 4.5 D
Heat of formation: 440 kJ mol-1
Added to system: 2003-05-06 06:43:21

Reactions: Formation | Destruction

42 HC4H formation reactions

ReactionαβγTl - Tu (K)
1H + C4H- → HC4H + e-8.30e-10 0.00 0.0010 - 300
2NO + C4H2+ → NO+ + HC4H3.80e-10 0.00 0.0010 - 41000
3C4H3+ + e- → HC4H + H3.10e-7-0.50 0.0010 - 300
4C4H5+ + e- → HC4H + H2 + H1.50e-7-0.50 0.0010 - 300
5C4H7+ + e- → HC4H + H2 + H2 + H3.00e-7-0.50 0.0010 - 300
6CH3OH + C4H3+ → CH3OH2+ + HC4H3.00e-10-0.50 0.0010 - 41000
7O + C5H3+ → HC4H + HCO+2.00e-10 0.00 0.0010 - 41000
8C- + C4H2+ → C + HC4H7.51e-8-0.50 0.0010 - 41000
9C10- + C4H2+ → C10 + HC4H7.51e-8-0.50 0.0010 - 41000
10C10H- + C4H2+ → C10H + HC4H7.51e-8-0.50 0.0010 - 41000
11C2- + C4H2+ → C2 + HC4H7.51e-8-0.50 0.0010 - 41000
12C2H- + C4H2+ → C2H + HC4H7.51e-8-0.50 0.0010 - 41000
13C3- + C4H2+ → C3 + HC4H7.51e-8-0.50 0.0010 - 41000
14C3H- + C4H2+ → C3H + HC4H7.51e-8-0.50 0.0010 - 41000
15C3N- + C4H2+ → C3N + HC4H7.51e-8-0.50 0.0010 - 41000
16C4- + C4H2+ → C4 + HC4H7.51e-8-0.50 0.0010 - 41000
17C4H- + C4H2+ → C4H + HC4H7.51e-8-0.50 0.0010 - 41000
18C5- + C4H2+ → C5 + HC4H7.51e-8-0.50 0.0010 - 41000
19C5H- + C4H2+ → C5H + HC4H7.51e-8-0.50 0.0010 - 41000
20C5N- + C4H2+ → C5N + HC4H7.51e-8-0.50 0.0010 - 41000
21C6- + C4H2+ → C6 + HC4H7.51e-8-0.50 0.0010 - 41000
22C6H- + C4H2+ → C6H + HC4H7.51e-8-0.50 0.0010 - 41000
23C7- + C4H2+ → C7 + HC4H7.51e-8-0.50 0.0010 - 41000
24C7H- + C4H2+ → C7H + HC4H7.51e-8-0.50 0.0010 - 41000
25C8- + C4H2+ → C8 + HC4H7.51e-8-0.50 0.0010 - 41000
26C8H- + C4H2+ → C8H + HC4H7.51e-8-0.50 0.0010 - 41000
27C9- + C4H2+ → C9 + HC4H7.51e-8-0.50 0.0010 - 41000
28C9H- + C4H2+ → C9H + HC4H7.51e-8-0.50 0.0010 - 41000
29CH- + C4H2+ → CH + HC4H7.51e-8-0.50 0.0010 - 41000
30CN- + C4H2+ → CN + HC4H7.51e-8-0.50 0.0010 - 41000
31H- + C4H2+ → H + HC4H7.51e-8-0.50 0.0010 - 41000
32O- + C4H2+ → O + HC4H7.51e-8-0.50 0.0010 - 41000
33O2- + C4H2+ → O2 + HC4H7.51e-8-0.50 0.0010 - 41000
34OH- + C4H2+ → OH + HC4H7.51e-8-0.50 0.0010 - 41000
35S- + C4H2+ → S + HC4H7.51e-8-0.50 0.0010 - 41000
36C2H + C2H2 → HC4H + H9.39e-11-0.20-4.1015 - 2000
37C + CH2CCH → HC4H + H1.00e-10 0.00 0.0010 - 300
38C + CH3CCH → HC4H + H24.20e-11-0.11 0.0010 - 300
39CH3CH3 + C4H → HC4H + C2H52.87e-11-1.2324.8039 - 300
40CH4 + C4H → HC4H + CH32.02e-11 0.00700.0010 - 999
41CH4 + C4H → HC4H + CH33.69e-13 2.83103.201000 - 3000
42C4H3 + PHOTON → HC4H + H1.00e-9 0.00 1.7010 - 41000

Variation of log fractional abundance (relative to H2) with log time (years) in a dark cloud model. Ref. RATE12 paper.