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^-

CH₄ + PHOTON → CH₂ + H₂

Type: Photoprocess
Alpha: 9.80e-10
Beta: 0.00
Gamma: 2.60
Temperature range: 10 - 41000 K
Accuracy: within 50%
Source: Calculation
Reference: Roberge, Jones, Lepp & Dalgarno, 1991, ApJS, 77, 287. View

UDfA History