CH4

Cross sections

Cross section figure.


[An explanation of the cross sections in this database]
[All cross sections — variable wavelength scale]
[All cross sections — variable wavelength scale in binary hdf5 format]
[All cross sections — 0.1nm wavelength scale]
[Photodissociation cross section — separate lines and continuum]
[Photoionisation cross section — separate lines and continuum]
[Download cross section figure as pdf]

Photodissociation and ionisation rates (s-1)

Radiation Photodissociation Photoionisation
ISRF 1.52e-09 1.03e-11
Mathis 1.08e-09 1.24e-11
4000K 1.68e-12 9.34e-18
10000K 2.67e-10 5.55e-13
20000K 1.27e-09 1.16e-11
Lyman-alpha 2.84e-09 3.29e-25
Solar 1.28e-10 9.34e-12
TW-Hya 1.95e-09 3.81e-11
Cosmic ray UV 1.53e-13 2.24e-15

[An explanation of the interstellar photo rates.]
[An explanation of the cosmic-ray induced photo rates.]
[An explanation of the radiation fields listed below.]
[Download all rates in a csv file.]

Shielding functions and fitted constants

Photodissociation

Radiation γE2 γexp k0fit γfit Line data Dust data
ISRF 2.19 3.08 0.48 2.71 [Download] [Download]
Mathis 2.22 3.11 0.47 2.73 [Download] [Download]
4000K 1.85 2.65 0.59 2.38 [Download] [Download]
10000K 2.02 2.86 0.53 2.55 [Download] [Download]
20000K 2.21 3.09 0.47 2.72 [Download] [Download]
Lyman-alpha 2.11 2.97 0.58 2.70 [Download] [Download]
Solar 2.14 3.01 0.55 2.71 [Download] [Download]
TW-Hya 2.13 2.99 0.56 2.70 [Download] [Download]

Photoionisation

Radiation γE2 γexp k0fit γfit Line data Dust data
ISRF 3.21 4.31 0.51 3.97 [Download] [Download]
Mathis 3.22 4.31 0.51 3.98 [Download] [Download]
4000K 3.11 4.13 0.45 3.74 [Download] [Download]
10000K 3.21 4.30 0.51 3.96 [Download] [Download]
20000K 3.21 4.30 0.51 3.97 [Download] [Download]
Lyman-alpha 2.16 3.03 0.58 2.76 [Download] [Download]
Solar 3.39 4.51 0.49 4.16 [Download] [Download]
TW-Hya 3.43 4.55 0.48 4.19 [Download] [Download]

[An explanation of the shielding functions and parameterisations.]
[Download all γ factors in a csv file.]
[Download all dust and line shielding functions in a zip file.]