H-

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]
[Photoionisation cross section — separate lines and continuum]
[Download cross section figure as pdf]

Photodissociation and ionisation rates (s-1)

Radiation Photodissociation Photoionisation
ISRF 1.46e-07
Mathis 1.57e-08
4000K 1.63e-03
10000K 2.46e-07
20000K 1.39e-08
Lyman-alpha 7.48e-10
Solar 1.45e-05
TW-Hya 2.26e-06
Cosmic ray UV 1.28e-13

[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 - - - -
Mathis - - - -
4000K - - - -
10000K - - - -
20000K - - - -
Lyman-alpha - - - -
Solar - - - -
TW-Hya - - - -

Photoionisation

Radiation γE2 γexp k0fit γfit Line data Dust data
ISRF 0.74 1.24 0.72 1.08 [Download] [Download]
Mathis 0.79 1.30 0.72 1.14 [Download] [Download]
4000K 0.70 1.14 0.77 1.01 [Download] [Download]
10000K 0.76 1.26 0.73 1.10 [Download] [Download]
20000K 0.83 1.43 0.65 1.21 [Download] [Download]
Lyman-alpha 2.11 2.97 0.58 2.70 [Download] [Download]
Solar 0.87 1.38 0.74 1.23 [Download] [Download]
TW-Hya 0.70 1.15 0.77 1.01 [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.]