CH

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 9.14e-10 7.63e-10
Mathis 6.35e-10 5.59e-10
4000K 1.73e-07 2.26e-14
10000K 2.21e-09 6.82e-11
20000K 9.58e-10 6.42e-10
Lyman-alpha 7.87e-12 0.00e+00
Solar 2.13e-07 9.64e-12
TW-Hya 1.13e-09 1.38e-10
Cosmic ray UV 1.08e-13 5.78e-14

[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 1.36 2.12 0.57 1.84 [Download] [Download]
Mathis 1.32 2.07 0.57 1.79 [Download] [Download]
4000K 1.03 1.57 0.73 1.41 [Download] [Download]
10000K 1.17 1.85 0.62 1.61 [Download] [Download]
20000K 1.42 2.18 0.58 1.91 [Download] [Download]
Lyman-alpha 2.11 2.97 0.58 2.70 [Download] [Download]
Solar 1.03 1.57 0.73 1.42 [Download] [Download]
TW-Hya 1.21 1.91 0.61 1.66 [Download] [Download]

Photoionisation

Radiation γE2 γexp k0fit γfit Line data Dust data
ISRF 2.70 3.67 0.50 3.33 [Download] [Download]
Mathis 2.72 3.69 0.49 3.34 [Download] [Download]
4000K 2.42 3.35 0.54 3.04 [Download] [Download]
10000K 2.63 3.59 0.50 3.25 [Download] [Download]
20000K 2.73 3.71 0.49 3.35 [Download] [Download]
Lyman-alpha - - - -
Solar 2.85 3.85 0.48 3.48 [Download] [Download]
TW-Hya 2.75 3.73 0.49 3.38 [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.]